JP6798454B2 - Vehicle measuring device - Google Patents

Description

The present disclosure relates to a vehicle measuring device for measuring a physical quantity.

Conventionally, a vehicle is provided with a vehicle measuring device for measuring a physical quantity. Such a vehicle measuring device includes a particle sensor that measures the concentration of suspended particles such as PM (particulate matter) 2.5 and dust, such as the sensor described in Patent Document 1, and a particle sensor for measuring the outside temperature. Examples include an outside air temperature sensor. The result measured by the vehicle measuring device is notified to the user by, for example, a display device provided near the driver's seat. In addition, the result measured by the vehicle measuring device may be used as a parameter for determining the operation content (for example, target temperature value or air volume) of the vehicle air conditioner.

JP-A-2017-39464

By the way, the measurement of physical quantities by such a vehicle measuring device is not always performed normally. For example, in the particle sensor described in Patent Document 1, a sensor abnormality is likely to occur due to the accumulation of suspended particles such as PM2.5 and dust on the sensor.

When an abnormality occurs in the sensor, problems such as notifying the user of an erroneous measurement result or causing the vehicle air conditioner to operate with an erroneous operation content based on the erroneous measurement result may occur.

However, Patent Document 1 does not particularly describe how to deal with an abnormality in the sensor.

An object of the present disclosure is to provide a vehicle measuring device for measuring a physical quantity, which can obtain a correct measurement result even when an abnormality occurs in a sensor.

The present disclosure is a vehicle measuring device, and includes a measured value acquisition unit (221), an external information acquisition unit (222), an abnormality determination unit (223), and a correction unit (224). The measured value acquisition unit acquires the measured physical quantity from the physical quantity sensor that measures the physical quantity. The external information acquisition unit acquires external information, which is information indicating the value of the physical quantity, in addition to the measured value of the physical quantity acquired from the physical quantity sensor. The abnormality determination unit executes an abnormality determination for determining whether or not the physical quantity sensor has an abnormality based on the difference between the measured physical quantity value and the external information. When the result of the abnormality determination by the abnormality determination unit indicates that the physical quantity sensor has an abnormality, the correction unit corrects the measured physical quantity so as to approach the value of the physical quantity of the external information.

According to the present disclosure, in addition to the measured physical quantity value acquired from the physical quantity sensor, external information which is information indicating the value of the physical quantity is acquired. When the result of the abnormality determination by the abnormality determination unit indicates that the physical quantity sensor has an abnormality, the physical quantity measurement value is corrected so as to approach the physical quantity value of the external information. Therefore, even if the physical quantity sensor outputs an erroneous value due to an abnormality such as a failure, the value is close to the physical quantity value of the external information, in other words, the external value is likely to be correct. Outputs a value close to the value of the physical quantity of information. From the above, according to the present disclosure, it is possible to obtain a correct measurement result even when an abnormality occurs in the physical quantity sensor.

FIG. 1 is a diagram schematically showing a configuration of a vehicle measuring device according to the present embodiment. FIG. 2 is a diagram for explaining an abnormality determination process executed by the control unit. FIG. 3 is a diagram for explaining an abnormality determination process executed by the control unit. FIG. 4 is a flowchart showing the flow of processing executed by the control unit. FIG. 5 is a flowchart showing a flow of processing executed by the control unit.

Hereinafter, the present embodiment will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as much as possible in each drawing, and duplicate description is omitted.

The vehicle measuring device 20 according to the present embodiment will be described with reference to FIGS. 1 to 5. Although the illustration of the overall configuration of the vehicle 10 is omitted, as shown in FIG. 1, the vehicle measuring device 20 is a device mounted on the vehicle 10 and is a peripheral region including the outside of the vehicle 10. It is configured as a device that measures the concentration of substances suspended in the air. A substance suspended in the air is also referred to as a "suspended solid" below. Examples of suspended solids include fine particles such as P2.5 and dust suspended in the air. Further, the concentration of suspended solids measured by the vehicle measuring device 20 is also referred to as "particle concentration" below. The vehicle measuring device 20 measures the particle concentration in the air passing through the vehicle air conditioner 30 mounted on the vehicle 10. Prior to the description of the configuration of the vehicle measuring device 20, the configuration of the vehicle air conditioner 30 will be described first.

The vehicle air conditioner 30 is a device for air-conditioning the interior of the vehicle. The vehicle air conditioner 30 includes an air conditioner case 300, a fan 310, a particle filter 320, and a heat exchange unit 330.

The air conditioning case 300 is a tubular member for guiding the air conditioning air into the vehicle interior. Inside the air conditioning case 300, air flows from the left side to the right side in FIG. The air-conditioning case 300 is formed with an inside air introduction unit 340, an outside air introduction unit 350, a face duct 360, and a foot duct 370.

The inside air introduction unit 340 is an introduction port for taking in the air in the vehicle interior (hereinafter referred to as inside air) inside the air conditioning case 300. The outside air introduction unit 350 is an introduction port for taking in the air outside the vehicle interior (hereinafter referred to as outside air) inside the air conditioning case 300. The inside air introduction section 340 and the outside air introduction section 350 are formed so as to line up in the upstream portion of the air conditioning case 300.

An inside / outside air switching door 380 is provided between the inside air introduction unit 340 and the outside air introduction unit 350. The inside / outside air switching door 380 is a door for switching between a state in which only the inside air introduction unit 340 is open as shown in FIG. 1 and a state in which only the outside air introduction unit 350 is open. The state in which only the inside air introduction unit 340 is open is a state in which the inside air taken in from the vehicle interior is air-conditioned and blown out into the vehicle interior, that is, an inside air circulation state. The state in which only the outside air introduction unit 350 is open is a state in which the outside air taken in from the outside of the vehicle interior is air-conditioned and blown out into the vehicle interior, that is, an outside air circulation state. The operation of the inside / outside air switching door 380 is controlled by the control unit 220 described later.

Both the face duct 360 and the foot duct 370 are outlets for guiding the conditioned air into the vehicle interior. The face duct 360 and the foot duct 370 are formed in the downstream portion of the air conditioning case 300. The face duct 360 is connected to a face outlet (not shown) for blowing air conditioning air toward the occupant's face. The foot duct 370 is connected to a foot outlet (not shown) for blowing air-conditioned air toward the feet of the occupant.

A face door 361 is provided at the entrance portion of the face duct 360. As shown in FIG. 1, when the face door 361 is in the open state, air conditioning air is supplied from the face duct 360 toward the face outlet. Similarly, a foot door 371 is provided at the entrance portion of the foot duct 370. When the foot door 371 is in the open state, air conditioning air is supplied from the foot duct 370 toward the foot outlet. The operation of each of the face door 361 and the foot door 371 is controlled by the control unit 220 described later.

In addition, for example, the downstream side of the face duct 360 may be branched into two, and one of them may be connected to a defroster outlet (not shown) formed in the vicinity of the window.

The fan 310 is a blower for sending air to the downstream side inside the air conditioning case 300. The rotation speed of the fan 310 is controlled by the control unit 220 described later. In other words, the air volume of the air conditioner air blown from the vehicle air conditioner 30 is controlled by the control unit 220 described later.

The particle filter 320 is a filter for removing fine particles contained in the air from the air passing through the air conditioning case 300. The particle filter 320 is provided at a position on the downstream side of the inside air introduction unit 340 and the outside air introduction unit 350 and on the upstream side of the fan 310.

The heat exchange unit 330 is a portion that performs air conditioning by exchanging heat with a refrigerant or the like. The heat exchange unit 330 is provided at a position on the downstream side of the fan 310 and on the upstream side of the face duct 360 and the foot duct 370. The heat exchange unit 330 includes an evaporator (not shown) for dehumidifying and cooling air, a heater core (not shown) for heating air, and a heater core (not shown) for adjusting the flow rate of air passing through them. Air mix doors, etc. are provided. Since a known configuration of the heat exchange unit 330 can be adopted, specific illustrations and explanations thereof will be omitted.

Subsequently, the configuration of the vehicle measuring device 20 will be described with reference to FIG. The vehicle measuring device 20 includes a particle sensor 200, a notification unit 210, a control unit 220, and a humidity sensor 230. The particle sensor 200 and / or the humidity sensor 230 may not be included in the vehicle measuring device 20 but may be separately provided outside.

The particle sensor 200 is a sensor for measuring the particle concentration in the air. As shown in FIG. 1, one end of the introduction pipe 390 is connected to a position of the air conditioning case 300 on the downstream side of the particle filter 320 and on the upstream side of the fan 310. The other end of the introduction pipe 390 is open to the passenger compartment. The particle sensor 200 is provided at a position in the middle of the introduction pipe 390. When air is flowing inside the air conditioning case 300, the negative pressure generated on the air conditioning case 300 side also causes an air flow in the introduction pipe 390. That is, an air flow is generated from the vehicle interior through the introduction pipe 390 and into the air conditioning case 300. The particle sensor 200 measures the concentration of suspended solids contained in the air and outputs the concentration as an electric signal to the control unit 220. In this embodiment, the particle sensor 200 may be replaced with one that measures the amount of particles. Further, in the present embodiment, the particle sensor 200 may be replaced with one installed outside the vehicle 10.

Although not shown, the particle sensor 200 has a light emitting unit and a light receiving unit, and is configured so that air flows between them. As the particle concentration of the air increases, the amount of light received by the light receiving unit decreases accordingly. The particle sensor 200 measures the particle concentration based on the amount of light received by the light receiving unit.

In order for the particle concentration to be accurately measured by the particle sensor 200, it is necessary that an air flow is generated in the introduction pipe 390. Therefore, the measurement of the particle concentration by the particle sensor 200 in the present embodiment is basically performed only in the situation where the air conditioner 30 for the vehicle is used for air conditioning.

The notification unit 210 is a unit that notifies the user of the measurement result (that is, the value of the particle concentration) by the particle sensor 200. The notification unit 210 further notifies the user of the maintenance recommended time obtained as the estimation result of the estimation unit 225 described later. In the present embodiment, when the estimation result of the estimation unit 225 described later indicates that "the period until the maintenance recommended time is within 3 months", "the period until the maintenance recommended time is 3 months". Notify the user with a message prompting the user to perform maintenance.

In the present embodiment, the notification unit 210 is configured as a liquid crystal display panel. That is, the notification to the user in this embodiment is performed by visual display. Instead of such a mode, a mode in which the notification unit 210 notifies the user by voice or the like may be used. The operation of the notification unit 210 is controlled by the control unit 220.

The control unit 220 is a device for controlling the overall operation of the vehicle measuring device 20. The control unit 220 is configured as a computer system including a CPU, ROM, RAM, and the like. As described above, the control unit 220 controls the operation of the inside / outside air switching door 380, the fan 310, and the like. That is, the control unit 220 in this embodiment is configured as a device that also controls the operation of the vehicle air conditioner 30. Instead of such a mode, the ECU for controlling the operation of the vehicle air conditioner 30 may be provided separately from the control unit 220. In this case, the control unit 220 may indirectly control a part of the operation of the vehicle air conditioner 30 by communicating with the ECU.

The control unit 220 controls to switch the opening degree of the inside / outside air switching door 380 based on the measurement result of the particle sensor 200. Specifically, when the measurement result of the particle sensor 200 indicates that the particle concentration of the outside air is equal to or higher than the predetermined value, the control unit 220 reduces the ratio of the outside air and indicates that the concentration is less than the predetermined value. When it is, increase the ratio of outside air. As a specific mode of such control, for example, the technique described in JP-A-2017-39464 can be adopted.

The control unit 220 has a measurement value acquisition unit 221, an external information acquisition unit 222, an abnormality determination unit 223, a correction unit 224, and an estimation unit 225 as functional configurations.

The measured value acquisition unit 221 is a portion that acquires the measurement result (that is, the particle concentration) of the physical quantity sensor (particle sensor 200). Hereinafter, the value of the physical quantity in the measurement result of this physical quantity sensor is also referred to as “physical quantity measurement value”.

The external information acquisition unit 222 is a portion that acquires external information, which is information indicating the value of the physical quantity, in addition to the value of the physical quantity (particle concentration) acquired from the physical quantity sensor (particle sensor 200). Although details will be described later, this external information is used for abnormality determination for determining whether or not there is an abnormality in the physical quantity sensor.

In the present embodiment, the external information acquisition unit 222 acquires the value of the particle concentration measured by the other vehicles 50 and 60 outside the vehicle 10 as external information. This external information also includes information indicating the position where the value of the particle concentration was measured. Specifically, the value of the particle concentration measured by the same particle sensor as the particle sensor 200 mounted on the other vehicles 50 and 60, and the GPS (Global Positioning System) transmission mounted on the other vehicles 50 and 60. The vehicle position information transmitted by the machine or the like is uploaded to the cloud server 40 via the wireless device or the like. The cloud server 40 creates a particle density map in which the area where the particle concentration is measured and the particle concentration value for each area are associated with each other based on the particle concentration value and the vehicle position information uploaded to the cloud server 40. create. The cloud server 40 interpolates so that the value of the particle concentration uploaded from the other vehicle 50 and the value of the particle concentration uploaded from the other vehicle 60 are smoothly connected.

The particle concentration value uploaded from the other vehicles 50 and 60 may be measured by a particle sensor provided in the vehicle interior of the other vehicles 50 and 60, and may be measured by a particle sensor provided in the vehicle interior of the other vehicles 50 and 60, and may be measured outside the vehicle interior of the other vehicles 50 and 60. It may be measured by a particle sensor provided in.

The external information acquisition unit 222 acquires the particle concentration value and the vehicle position information uploaded to the cloud server 40 by downloading from the cloud server 40 via the network line. At this time, the particle concentration value acquired by the external information acquisition unit 222 is the median value of each value measured by each of the other vehicles 50 and 60 within a predetermined range centered on the vehicle 10, or in the particle concentration map. The value of the particle concentration at the position of the vehicle 10 of the above can be adopted.

The abnormality determination unit 223 determines whether or not there is an abnormality in the physical quantity sensor based on the difference between the value of the physical quantity (particle concentration) acquired from the physical quantity sensor (particle sensor 200) and the value of external information. Is the part that executes. In the abnormality determination in the present embodiment, since the external information which is the value of the other vehicles 50 and 60 and the value of the particle concentration map is compared, the particle sensor 200 can be used even in a situation where the particle concentration is locally changed. Whether or not there is an abnormality can be determined with high accuracy. The "difference between the value of the physical quantity (particle concentration) acquired from the physical quantity sensor (particle sensor 200) and the value of external information" is also referred to as "sensor error" below. As an abnormality determination, the particle sensor 200 determines that "the particle sensor 200 has an abnormality" when the sensor error is equal to or more than a predetermined threshold value, and "there is no abnormality in the particle sensor 200" when the sensor error is less than the predetermined threshold value. ". In the above abnormality determination, the abnormality determination unit 223 compares the value of the physical quantity (particle concentration) expressed in the same unit with the value of the external information to obtain the value of the physical quantity (particle concentration) and the outside. Determine the difference from the information value.

When the result of the abnormality determination indicates that the physical quantity sensor (particle sensor 200) has an abnormality, the correction unit 224 sets the value of the physical quantity (particle concentration) acquired from the physical quantity sensor as the physical quantity of the external information. This is the part that is corrected so that it approaches the value. When the value of the particle concentration acquired from the particle sensor 200 is A, the value of the particle concentration of external information is B, the sensor error is C (= | AB |), and a predetermined constant coefficient is α. In the present embodiment, the correction unit 224 corrects the particle concentration value A acquired from the particle sensor 200 as shown in the following mathematical formula. First, in the case of A> B, the correction unit 224 executes the correction based on the mathematical formula (1) and calculates the corrected Arev.
Arev = A-α × C (1)

When A <B, the correction unit 224 executes the correction based on the mathematical formula (2) and calculates the corrected Arev.
Arev = A + α × C (2)

As described above, in the present embodiment, the correction unit 224 corrects the value A measured by the particle sensor 200 to a value according to the degree of the sensor error C.

As a result of the above correction by the correction unit 224, the vehicle air conditioner 30 has a value close to the value of the particle concentration of the external information, in other words, a value of the particle concentration of the external information which is a highly probable value that is correct. Outputs a value close to ,. When the above correction is made, the notification unit 210 notifies the corrected value.

In the present embodiment, the vehicle measuring device 20 includes a humidity sensor 230. The humidity sensor 230 measures the humidity of the air and outputs the humidity as an electric signal to the control unit 220. The abnormality determination unit 223 determines whether or not the humidity acquired from the humidity sensor 230 is equal to or higher than a predetermined humidity. When the humidity acquired from the humidity sensor 230 is equal to or higher than the predetermined humidity, the abnormality determination unit 223 determines that "a temporary incorrect value is output due to dew condensation on the particle sensor 200". However, the abnormality judgment is not executed.

The estimation unit 225 is a part that estimates the maintenance recommended time, which is the recommended time for maintenance of the physical quantity sensor when the result of the abnormality determination indicates that the physical quantity sensor (particle sensor 200) has an abnormality. .. The estimation unit 225 outputs the maintenance recommended time as an electric signal to the notification unit 210.

In the present embodiment, the estimation unit 225 determines at least one of the degree of sensor error, the frequency with which the result of abnormality determination indicates that the particle sensor 200 has an abnormality, and the period of use of the particle sensor 200. Based on this, estimate the recommended maintenance time. In the following, "the frequency at which the result of the abnormality determination indicates that the physical quantity sensor (particle sensor 200) has an abnormality" is also referred to as "abnormality determination frequency".

An example of such estimation will be described with reference to FIGS. 2 and 3. In this embodiment, the estimation unit 225 estimates the recommended maintenance time based on all of the degree of sensor error, the frequency of abnormality determination, and the usage period of the particle sensor 200. In this embodiment, "the number of months from the present time to the final point of the preferable period for performing maintenance" is used as the "recommended maintenance time". Further, in this embodiment, there is a correspondence relationship between the sensor error and abnormality determination frequency and the recommended maintenance period [months] as shown in FIGS. 2 and 3 for each number of years of use of the particle sensor 200. It is set in advance.

FIG. 2 shows the correspondence between the sensor error and abnormality determination frequency when the usage period of the particle sensor 200 is “less than one year” and the recommended maintenance period [months]. FIG. 3 shows the correspondence between the sensor error and abnormality determination frequency when the usage period of the particle sensor 200 is “1 year or more and less than 2 years” and the recommended maintenance period [months]. As shown in FIG. 2, when the usage period of the particle sensor 200 is "less than one year", for example, when the sensor error is "less than T1" and the abnormality determination frequency is "less than F1", the estimation unit 225 , The recommended maintenance period [months] is estimated to be "18 months". If the sensor error is "T1 or more and less than T2" and the abnormality determination frequency is "less than F1", the recommended maintenance period [months] is estimated to be "15 months". If the sensor error is "T4 or more" and the abnormality judgment frequency is "F1 or more and less than F2", the recommended maintenance period [months] is estimated to be "3 months". As for FIG. 3, the correspondence between the contents of the figure and the estimation result of the estimation unit 225 is the same as described above.

In the case of FIG. 3, since the usage period of the particle sensor 200 is longer than that in the case of FIG. 2, the sensor error and the abnormality determination frequency are the same conditions as in the case of FIG. The recommended maintenance period [months] is decreasing.

In the present embodiment, when the maintenance recommended time [months] is within 3 months, the estimation unit 225 outputs to that effect as an electric signal to the notification unit 210.

Subsequently, the control operation of the control unit 220 will be described with reference to FIGS. 4 and 5. In the following, only the control related to the characteristic portion of the present disclosure, which is executed by the measured value acquisition unit 221, the external information acquisition unit 222, the abnormality determination unit 223, the correction unit 224, and the estimation unit 225, will be described. As for other controls executed by the control unit 220, for example, the technique described in JP-A-2017-39464 can be adopted, and the description thereof will be omitted.

In step S101 of FIG. 4, the external information acquisition unit 222 acquires the external information. In step S102 following step S101, the measurement value acquisition unit 221 acquires the measurement result (that is, the particle concentration) of the particle sensor 200. In step S103 following step S102, the abnormality determination unit 223 determines the abnormality. The abnormality determination will be described with reference to FIG.

In step S1031 of FIG. 5, the abnormality determination unit 223 determines whether or not there is a sensor error. If there is no sensor error, the process proceeds to step S108 of FIG. Step S108 will be described later. If there is a sensor error, the process proceeds to step S1032.

In step S1032, the abnormality determination unit 223 determines whether or not the humidity acquired from the humidity sensor 230 is equal to or higher than the predetermined humidity. If the humidity is equal to or higher than the predetermined humidity, the process proceeds to step S108 of FIG. Step S108 will be described later. If the humidity is not equal to or higher than the predetermined humidity, the process proceeds to step S104 of FIG.

Returning to FIG. 4, in step S104, the correction unit 224 corrects the measured value of the physical quantity sensor (particle sensor 200). Specifically, the correction unit 224 corrects the value of the particle concentration measured by the particle sensor 200 so as to approach the value of the particle concentration of the external information as described above.

In step S105 following step S104, the estimation unit 225 estimates the recommended maintenance time. In step S106 following step S105, the estimation unit 225 determines whether or not the period until the maintenance recommended time is within 3 months. If the period until the recommended maintenance period is not within 3 months, the process proceeds to step S108. Step S108 will be described later. If the period up to the recommended maintenance period is within 3 months, the process proceeds to step S107.

In step S107 following step S106, the notification unit 210 notifies the user of the measurement result by the physical quantity sensor (particle sensor 200) and the recommended maintenance time, and ends a series of processes.

In step S108, the notification unit 210 notifies the user of the measurement result by the physical quantity sensor (particle sensor 200) and the recommended maintenance time, and ends a series of processes.

As described above, the vehicle measuring device 20 according to the present embodiment includes a measured value acquisition unit 221, an external information acquisition unit 222, an abnormality determination unit 223, and a correction unit 224. The measured value acquisition unit 221 acquires the measured physical quantity from the physical quantity sensor (particle sensor 200) that measures the physical quantity. The external information acquisition unit 222 acquires external information, which is information indicating the value of the physical quantity, in addition to the measured value of the physical quantity acquired from the physical quantity sensor. The abnormality determination unit 223 executes an abnormality determination for determining whether or not there is an abnormality in the physical quantity sensor based on the difference between the measured physical quantity value and the value of the external information. When the result of the abnormality determination by the abnormality determination unit 223 indicates that the physical quantity sensor has an abnormality, the correction unit 224 corrects the physical quantity measurement value so as to approach the value of the physical quantity of the external information.

According to the present embodiment, in addition to the physical quantity measured value acquired from the physical quantity sensor, external information which is information indicating the value of the physical quantity is acquired. When the result of the abnormality determination by the abnormality determination unit 223 indicates that the physical quantity sensor has an abnormality, the measured physical quantity is corrected so as to approach the value of the physical quantity of the external information. Therefore, even if the physical quantity sensor outputs an erroneous value due to an abnormality such as a failure, the value is close to the physical quantity value of the external information, in other words, the external value is likely to be correct. Outputs a value close to the value of the physical quantity of information. From the above, according to the present embodiment, a correct measurement result can be obtained even when an abnormality occurs in the physical quantity sensor.

In the present embodiment, the external information acquisition unit 222 acquires the value of the physical quantity measured by the other vehicles 50 and 60 outside the vehicle 10 as external information.

According to the present embodiment, it is determined whether or not there is an abnormality in the physical quantity sensor using the values measured by the other vehicles 50 and 60 outside the vehicle 10, and if there is an abnormality, it is acquired from the physical quantity sensor. The value of the physical quantity obtained is corrected so as to approach the value of the physical quantity of the external information. Since the values measured by the other vehicles 50 and 60 outside the vehicle 10 reflect the actual external environmental conditions, it is highly probable that they are more correct than the weather information provided by the weather information provider. .. Therefore, in the present embodiment, by correcting so as to approach this value, a value having a particularly high probability of being correct is output. From the above, according to the present embodiment, even if an abnormality occurs in the particle sensor 200, it is possible to obtain a measurement result having a particularly high probability of being correct.

In the present embodiment, the correction unit 224 corrects the value measured by the physical quantity sensor to a value according to the degree of difference from the value of the external information.

According to this embodiment, the value measured by the particle sensor 200 is corrected to a value according to the degree of difference from the value of external information. The value corrected in this way is more realistic than the value corrected without taking into account the degree of difference, such as a value corrected by adding or subtracting a constant value from the value measured by the particle sensor 200. There is a high probability that it is the correct one to do. For example, even when a large sensor error occurs, such as when a large amount of suspended solids adheres to the particle sensor 200 or when the sensor element of the particle sensor 200 deteriorates, the degree of the sensor error should be dealt with. Can be corrected. From the above, according to the present embodiment, even if an abnormality occurs in the particle sensor 200, it is possible to obtain a measurement result having a particularly high probability of being correct.

In the present embodiment, the physical quantity sensor is a sensor that measures a substance suspended in the air.

When a sensor that measures suspended solids such as P2.5 and dust suspended in the air is used as the physical quantity sensor, an abnormality such as a failure occurs in the sensor due to the accumulation of suspended solids. easy. Therefore, when the particle sensor 200 for measuring suspended solids is used, the configuration of the present embodiment performs the above-mentioned abnormality determination and corrects the measured value of the particle sensor 200 as described above when there is an abnormality. Especially suitable.

The vehicle measuring device 20 according to the present embodiment acquires humidity data from the humidity sensor 230 that measures the humidity of air, and when the humidity data indicates a predetermined humidity or higher, the abnormality determination unit 223 determines the abnormality. Do not execute.

The particle sensor 200 for measuring suspended solids temporarily outputs an erroneous value even if there is no abnormality such as a failure in the particle sensor 200 due to dew condensation on the particle sensor 200 in an environment where the humidity is high to some extent. There is. Even in such a case, if it is determined that the particle sensor 200 has an abnormality in the abnormality determination and the measured value of the particle sensor 200 is corrected, inconvenience may occur.

According to this embodiment, when the humidity data indicates a predetermined humidity or higher, the abnormality determination is not executed. Therefore, it is not necessary to correct the measured value even when there is no abnormality such as a failure only by outputting an erroneous value due to dew condensation on the particle sensor 200. As a result, according to the present embodiment, it is possible to obtain a measurement result having a particularly high probability of being correct.

The vehicle measuring device 20 according to the present embodiment estimates the maintenance recommended time, which is the recommended time for performing maintenance of the physical quantity sensor when the result of the abnormality determination indicates that the physical quantity sensor has an abnormality. The estimation unit 225 is further provided. Further, the vehicle measuring device 20 includes a notification unit 210 that notifies the user of the recommended maintenance time obtained as the estimation result of the estimation unit 225.

According to this embodiment, the maintenance recommended time, which is the recommended time for performing maintenance of the physical quantity sensor, is estimated, and the estimated maintenance recommended time is notified to the user. As a result, according to the present embodiment, the user can know the recommended maintenance time of the physical quantity sensor when the physical quantity sensor outputs an erroneous value due to an abnormality such as a failure. , You can take appropriate measures based on the time.

In the present embodiment, the estimation unit 225 indicates the degree of difference between the physical quantity value acquired from the physical quantity sensor and the physical quantity value of the external information, and the result of the abnormality determination indicates that the physical quantity sensor has an abnormality. Estimate the recommended maintenance time based on at least one of the frequency and the period of use of the physical quantity sensor.

According to the present embodiment, the degree of difference between the physical quantity value acquired from the physical quantity sensor and the physical quantity value of the external information, the frequency at which the result of the abnormality determination indicates that the physical quantity sensor has an abnormality, and Estimate the recommended maintenance time based on at least one of the period of use of the physical quantity sensor. Therefore, a particularly accurate maintenance recommendation time is estimated. This allows the user to know a particularly appropriate maintenance recommendation time.

In the above embodiment described with reference to FIGS. 4 and 5, the abnormality determination unit 223 executes the abnormality determination using the external information after the external information acquisition unit 222 has acquired the external information. It was. However, in the present embodiment, the abnormality determination unit 223 may execute the abnormality determination using the external information at the same time as the external information acquisition unit 222 acquires the external information.

According to the present embodiment having such a configuration, at the same time as the external information acquisition unit 222 acquires the external information, the abnormality determination is executed using the external information. Therefore, the abnormality determination is executed using the latest external information, and if there is an abnormality in the particle sensor 200, the measured value of the particle sensor 200 is corrected. The latest external information is more likely to be more relevant and correct than the old information. Therefore, in this embodiment, by correcting the value so as to approach the latest value of the external information, a value having a particularly high probability of being correct is output. From the above, according to this embodiment, it is possible to obtain a measurement result having a particularly high probability of being correct.

In the present embodiment, an example in which the present disclosure is applied to an embodiment including a particle sensor 200 for measuring suspended solids suspended in the air has been shown, but instead of such a particle sensor 200, another other such as an outside temperature sensor is shown. The present disclosure may be applied to an embodiment including a physical quantity sensor for measuring a physical quantity.

In the present embodiment, the external information acquisition unit 222 acquires the value of the physical quantity measured by the other vehicles 50 and 60 outside the vehicle 10 as external information. Instead of such an embodiment, an embodiment may be used in which information indicating the value of the physical quantity provided by an external information provider is acquired as external information.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those skilled in the art with appropriate design changes to these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the above-mentioned specific examples, its arrangement, conditions, shape, etc. is not limited to the illustrated one, and can be appropriately changed. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

20 Vehicle measuring device 200 Particle sensor (physical quantity sensor)
210 Notification unit 221 Measured value acquisition unit 222 External information acquisition unit 223 Abnormality determination unit 224 Correction unit 225 Estimating unit 230 Humidity sensor

Claims (6)

It is a measuring device for vehicles
A measurement value acquisition unit (221) that acquires a physical quantity measurement value from a physical quantity sensor that measures a physical quantity, and
In addition to the physical quantity measurement value acquired from the physical quantity sensor, an external information acquisition unit (222) that acquires external information that is information indicating the physical quantity value, and
An abnormality determination unit (223) that executes an abnormality determination to determine whether or not the physical quantity sensor has an abnormality based on the difference between the measured physical quantity value and the external information value.
When the result of the abnormality determination by the abnormality determination unit indicates that the physical quantity sensor has an abnormality, the correction unit (224) corrects the physical quantity measurement value so as to approach the physical quantity value of the external information. and, with a,
The physical quantity sensor is a sensor that measures a substance suspended in the air.
The measured value acquisition unit acquires humidity data from a humidity sensor that measures the humidity of air, and obtains humidity data.
A vehicle measuring device that does not execute the abnormality determination when the humidity data indicates a predetermined humidity or more . The vehicle measuring device according to claim 1.
The external information acquisition unit is a vehicle measuring device that acquires the value of the physical quantity measured by another external vehicle as the external information. The vehicle measuring device according to claim 1 or 2.
The abnormality determination unit is a vehicle measuring device that executes the abnormality determination using the external information at the same time as the external information acquisition unit acquires the external information. The vehicle measuring device according to any one of claims 1 to 3.
The correction unit is a vehicle measuring device that corrects the physical quantity measurement value so as to be a value according to the degree of difference with respect to the value of the external information. The vehicle measuring device according to any one of claims 1 to 4 .
When the result of the abnormality determination indicates that the physical quantity sensor has an abnormality, the estimation unit (225) estimates the maintenance recommended time, which is the recommended time for maintenance of the physical quantity sensor.
A vehicle measuring device further comprising a notification unit (210) for notifying the user of the recommended maintenance time obtained as an estimation result of the estimation unit. The vehicle measuring device according to claim 5 .
The estimation unit indicates the degree of difference between the value of the physical quantity measured by the physical quantity sensor and the value of the physical quantity of the external information, and the result of the abnormality determination indicates that the physical quantity sensor has an abnormality. A vehicle measuring device that estimates the recommended maintenance time based on at least one of the frequency and the period of use of the physical quantity sensor.

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