JP2024067957A - Deterioration determination system for exhaust gas sensor, and server - Google Patents

Abstract

To provide a deterioration determination system for an exhaust gas sensor capable of accurately measuring an exhaust gas, and a server.SOLUTION: A server 3 receives a measurement of an exhaust gas and operation information collected by an operation recording device 2. The server 3 estimates an estimate of the exhaust gas on the basis of the operation information. On the basis of a difference between the estimate of the exhaust gas and the measurement of the exhaust gas, the server 3 determines deterioration of an exhaust gas sensor 105.SELECTED DRAWING: Figure 1

Description

The present invention relates to an exhaust gas sensor deterioration determination system and a server.

In order to strengthen recent efforts to reduce greenhouse gas emissions, a system has been proposed that analyzes real-time measurement data from driving recorders for driving information (engine RPM) and exhaust gas (= greenhouse gas emissions), and feeds back the analysis results to the vehicle and the driver, encouraging driving techniques that take environmental impact into consideration.

A route search device is also known that searches for a route between a departure point and a destination that will minimize greenhouse gas emissions (Patent Document 1). The route search device in Patent Document 1 is described as calculating the amount of greenhouse gas emissions emitted when traveling along a route using a conversion formula that calculates the amount of greenhouse gas emissions from travel speed. It is also described that the conversion formula is created based on measured values of greenhouse gas emissions.

JP 2005-30823 A

However, conventional technology does not take into account the degradation of exhaust gas sensors that measure exhaust gas, which can cause a drop in measurement values. In particular, exhaust gas sensors installed in vehicles that are used regularly for long periods of time, such as large vehicles and commercial vehicles, are likely to deteriorate faster than under normal operating conditions, which can hinder accurate exhaust gas measurements.

The present invention was made in consideration of the above-mentioned circumstances, and its purpose is to provide an exhaust gas sensor deterioration determination system and a server that can measure exhaust gas with high accuracy.

In order to achieve the above-mentioned object, the deterioration determination system for an exhaust gas sensor according to the present invention has the following features.
An on-board device that collects exhaust gas measurement values measured by an exhaust gas sensor mounted on a vehicle and operation information of the vehicle;
a server for determining deterioration of the exhaust gas sensor;
The server,
an acquisition unit that acquires the measurement values of the exhaust gas and the operation information collected by the in-vehicle device;
an estimation unit that estimates the estimated value of the exhaust gas based on the operation information;
a deterioration determination unit that determines deterioration of the exhaust gas sensor based on a difference between the estimated value of the exhaust gas and the measured value of the exhaust gas.

In order to achieve the above-mentioned object, the server according to the present invention has the following features.
An acquisition unit that acquires exhaust gas measurement values measured by an exhaust gas sensor mounted on a vehicle and operation information of the vehicle;
an estimation unit that estimates the estimated value of the exhaust gas based on the operation information;
A deterioration determination unit that determines deterioration of the exhaust gas sensor based on a difference between the estimated value of the exhaust gas and the measured value of the exhaust gas.
It is a server.

The exhaust gas sensor deterioration determination system and server of the present invention have the effect of enabling accurate measurement of exhaust gas.

The present invention has been briefly described above. The details of the present invention will become clearer by reading the following description of the embodiment of the invention (hereinafter referred to as "embodiment") with reference to the attached drawings.

FIG. 1 is a diagram showing an example of a deterioration determination system for an exhaust gas sensor according to the present invention. FIG. 2 is a block diagram showing an example of the operation recorder, the server, and the management terminal shown in FIG. FIG. 3 is a flowchart showing a degradation determination process for the server shown in FIG. FIG. 4 is an explanatory diagram for explaining each list created in the deterioration determination process procedure of FIG. FIG. 5 is a graph for explaining a table used by the server shown in FIG. 1 to obtain an estimated value of exhaust gas. FIG. 6 is a diagram showing an example of a driving record table displayed on the management terminal shown in FIG.

Specific embodiments of the present invention are described below with reference to the drawings.

The exhaust gas sensor deterioration determination system 1 of this embodiment (hereinafter simply referred to as "deterioration determination system 1") is a system that performs deterioration determination of an exhaust gas sensor 105 mounted on a vehicle 10. As shown in FIG. 1, the deterioration determination system 1 includes a driving recorder 2 as an on-board device mounted on the vehicle 10, a server 3 that can communicate with the driving recorder 2 via a wide area communication network 11, and a management terminal 4 that can communicate with the server 3 via the wide area communication network 11.

In this embodiment, the operation recording device 2 is mounted on a vehicle 10 managed by an operator, and collects and transmits actual exhaust gas measurements and operation information to a server 3. As shown in FIG. 2, the operation recording device 2 has a wide area communication unit 21, a temporary storage device 22, a media R/W 23, and a CPU (Central Processing Unit) 24.

The wide area communication unit 21 is composed of circuits and antennas for connecting to the wide area communication network 11. The temporary storage device 22 is a device that temporarily stores the actual exhaust gas measurements and operation information collected by the operation recording device 2. The media R/W 23 is a device that reads and writes to storage media such as SD (Secure Digital) cards.

The CPU 24 operates according to a program and controls the entire operation recording device 2. The CPU 24 periodically (e.g., every 0.5 seconds) collects exhaust gas measurement values and operation information (vehicle speed, engine RPM, accelerator opening, position information), and sends the collected exhaust gas measurement values and operation information to the server 3 together with a vehicle ID and time information.

A vehicle speed sensor 101, an engine revolution sensor 102, an accelerator opening sensor 103, a GPS unit 104, and an exhaust gas sensor 105 are connected to the CPU 24. The vehicle speed sensor 101 measures the vehicle speed and outputs it to the CPU 24. The engine revolution sensor 102 measures the engine revolutions and outputs it to the CPU 24. The accelerator opening sensor 103 measures the accelerator opening and outputs it to the CPU 24.

As is well known, the GPS unit 104 receives radio waves emitted from multiple GPS satellites, determines current location information, and outputs the location information and current time information to the CPU 24. The exhaust gas sensor 105 measures exhaust gas and outputs the exhaust gas measurement value to the CPU 24.

The server 3 receives and records the exhaust gas measurement values and operation information transmitted from the vehicle 10, and performs a deterioration judgment of the exhaust gas sensor 105 based on the exhaust gas measurement values and operation information. As shown in FIG. 2, the server 3 has a wide area communication unit 31, a database (DB) 32 as a storage unit, and a CPU 33.

The wide area communication unit 31 is composed of circuits for connecting to the wide area communication network 11. The DB 32 records operation information transmitted from the operation recording device 2 mounted on each vehicle 10. The CPU 33 operates according to a program and controls the entire server 3.

The management terminal 4 is composed of a terminal such as a PC (Personal Computer) or a tablet, and communicates with the server 3 via the wide area communication network 11. As shown in FIG. 2, the management terminal 4 has a wide area communication unit 41, an operation unit 42 as an input unit, a display unit 43, and a CPU 44. The wide area communication unit 41 is composed of a circuit for connecting to the wide area communication network 11, etc. The operation unit 42 is composed of a keyboard and mouse in the case of a PC, and is composed of a touch panel or the like in the case of a tablet, and various information is input by user operation.

The display unit 43 is composed of a liquid crystal display or the like, and displays various information under the control of the CPU 44. The CPU 44 operates according to a program and is responsible for controlling the entire management terminal 4. A program (application) for the management terminal 4 is installed in the management terminal 4, and by operating according to this program, it functions as the management terminal 4 that constitutes the deterioration determination system 1.

Next, the operation of the deterioration determination system 1 configured as described above will be described. The CPU 24 of the driving recorder 2 (hereinafter simply referred to as "driving recorder 2") starts up, for example, when the vehicle's ignition switch is turned on. After starting up, the driving recorder 2 captures and collects the vehicle speed, engine RPM, accelerator opening, and position information output from the vehicle speed sensor 101, engine revolution sensor 102, accelerator opening sensor 103, and GPS unit 104 as driving information, for example, every 0.5 seconds. At the same time, the driving recorder 2 captures and collects the actual exhaust gas measurement output from the exhaust gas sensor 105.

Each time the operation recording device 2 collects operation information and exhaust gas measurement values, it assigns a vehicle ID and the current time and transmits them to the server 3. The CPU 33 of the server 3 (hereinafter simply abbreviated as "server 3") functions as an acquisition unit, and upon receiving operation information and exhaust gas measurement values, stores the received operation information and exhaust gas measurement values in DB 32. Through the above operations, operation information and exhaust gas measurement values for multiple operations of multiple vehicles 10 are stored in DB 32.

The server 3 performs a deterioration determination process that analyzes the driving information and exhaust gas measurement values stored in the DB 32 to determine whether or not deterioration has occurred in the exhaust gas sensor 105 installed in each vehicle 10. This deterioration determination process will be described with reference to FIG. 3.

First, the server 3 extracts from the DB 32 the position information collected by the driving recording device 2 during one operation (S1). Next, the server 3 determines whether the driving route, which is the time series data of the extracted position information, is the first driving route since the new exhaust gas sensor 105 began to be used (S2). If it is determined that it is the first driving route (Y in S2), the server 3 extracts from the DB 32 the exhaust gas measurement values linked to the position information (i.e., each point A-J on the driving route) as shown in FIG. 4, and creates a list of exhaust gas measurement values (S3).

Next, the server 3 functions as an estimation unit, and calculates an estimated value of exhaust gas for each point A to J based on the catalog value of exhaust gas and the operation information (e.g., engine speed, vehicle speed), creates an estimated value list, and stores it in the DB 32 (S4). To be more specific, the vehicle manufacturer discloses the catalog value of exhaust gas M1 (g/km) per unit distance when traveling at a speed N1 (km/h).

The instantaneous exhaust gas volume per second (g/sec) can be calculated using the following formula (1).
(M1/3600) × N1 (g/sec) ... (1)
From equation (1) it can be seen that the exhaust gas is speed dependent.

Furthermore, exhaust gas is roughly proportional to fuel economy. Fuel economy (fuel used) depends on engine speed; if the engine speed is low, more fuel is used, if the engine speed is appropriate (medium), less fuel is used, and if the engine speed is high, more fuel is used. Therefore, as shown in Figure 5, a table of estimated exhaust gas values for engine speed for each vehicle speed is created from the catalog values of exhaust gas, and is stored in advance in DB32.

The server 3 extracts from the DB 32 the vehicle speed and engine speed associated with points A to J on the travel route, and estimates an exhaust gas estimate for each of the points A to J based on the estimated value table stored in the DB 32 and the extracted vehicle speed and engine speed. Specifically, the server 3 uses the estimated value table corresponding to the vehicle speed at the point A to determine the exhaust gas corresponding to the engine speed at the point A, and sets this as the exhaust gas estimate for the point A. The server 3 similarly determines the exhaust gas estimate for the points B to J.

Next, using the exhaust gas measurement value list created in S3 and the exhaust gas estimated value list created in S4, the server 3 calculates the difference by subtracting the exhaust gas estimated value from the exhaust gas measurement value for each point A to J, creates a reference value list in which the calculated difference is used as the reference value for points A to J, saves this in DB32 (S5), and ends the process.

On the other hand, if it is determined in S2 that this is the second or subsequent travel route (N in S2), the server 3 creates a list of exhaust gas measurement values for each of points A to J, as in S3 (S6). Next, the server 3 uses the exhaust gas amount measurement list created in S6 and the exhaust gas estimated value list created in S4 and stored in DB32 to create a judgment value list in which the difference between the exhaust gas measurement value for each of points A to J and the exhaust gas estimated value is used as the judgment value for points A to J (S7).

In the next step S8, the server 3 determines whether the exhaust gas measurement value at each point A-J is an abnormal value below the normal range due to deterioration of the exhaust gas sensor 105, and creates a determination result list. The server 3 also determines whether the exhaust gas measurement value at each point A-J is an abnormal value above the normal range due to a vehicle abnormality, and creates a determination result list. In S8, the server 3 makes the above determination by comparing the reference value at each point A-J with the determination value at each point A-J.

Specifically, as shown in the following formula (2), if a difference D1 obtained by subtracting the judgment value from the reference value is equal to or greater than (reference value×M2%), the server 3 judges that the exhaust gas sensor 105 has deteriorated.
Reference value-Determination value=D1≧Reference value×M2% (2)

That is, as the deterioration of the exhaust gas sensor 105 progresses, the measured value of the exhaust gas decreases, the judgment value becomes smaller, and the difference D1 becomes larger. When the difference D1 becomes larger than M2% of the reference value, the server 3 judges that the measured value of the exhaust gas is abnormal due to the deterioration of the exhaust gas sensor 105. That is, by making the judgment using the above formula (2), the lower limit of the normal range of the actual measured value of the exhaust gas is set to (actual measured value of the exhaust gas during the first run - reference value x M2%). In this embodiment, for example, M2% = 50%. In the example shown in FIG. 4, the server 3 judges that the sensor has deteriorated at point H.

In addition, in S9, the server 3 determines that a vehicle abnormality has occurred if a difference D1 obtained by subtracting the determination value from the reference value is equal to or less than the reference value×−N2%, as shown in the following formula (3).
Reference value-judgment value=D1≦reference value×−N2% (3)

That is, when an abnormality occurs in the vehicle, the exhaust gas measurement value rises, the judgment value increases, and the difference D1 decreases. When the difference D1 decreases by more than the reference value x (-N2)%, it is judged that the exhaust gas measurement value is abnormal due to a vehicle abnormality. That is, by making a judgment using the above formula (3), the upper limit of the normal range of the actual exhaust gas measurement value is set to (actual exhaust gas measurement value during the first run + reference value x N2%). In this embodiment, for example, N2% = 50%. In the example shown in FIG. 4, the server 3 judges that a vehicle abnormality has occurred at point D.

Next, the server 3 calculates the percentage of points A to J that are judged to be deteriorated and the percentage that are judged to be a vehicle abnormality (S9). In the example shown in FIG. 4, the only point among points A to J that is judged to be deteriorated is point H, so the percentage that is judged to be deteriorated is calculated to be 10%. Also, the only point among points A to J that is judged to be a vehicle abnormality is point D, so the percentage that is judged to be a vehicle abnormality is calculated to be 10%.

If the deterioration judgment rate is equal to or higher than M3% (=first threshold value) (Y in S10), the server 3 judges that the exhaust gas sensor 105 is deteriorated (S11). If the vehicle abnormality judgment rate is equal to or higher than N3 (Y in S12), the server 3 judges that a vehicle abnormality has occurred (S12) and ends the process. The server 3 functions as a deterioration judgment unit in S5 to S13.

In this embodiment, in addition to determining deterioration, the server 3 performs operation information analysis processing to obtain the number of times speeding, the number of times sudden acceleration, the number of times sudden deceleration, etc. from the operation information, and provides the deterioration determination results and operation information analysis results to the management terminal 4.

Next, the operation of the server 3 and the management terminal 4 at this time will be described below. The manager uses the management terminal 4 to manage the vehicle 10. A user such as the manager operates the operation unit 42 of the management terminal 4 to start an application for the management terminal 4 in the deterioration determination system 1. Upon starting, the CPU 44 of the management terminal 4 (hereinafter simply abbreviated as "management terminal 4") displays a search screen for the operation record table on the display unit 43.

The administrator operates the operation unit 42 according to the display on the search screen to input the target period and the ID of the target vehicle. The management terminal 4 transmits the input target period and target vehicle to the server 3. When the server 3 receives the target period and target vehicle, it creates an operation performance table as shown in FIG. 6, which displays the results of the deterioration judgment of the exhaust gas sensor of the target vehicle during the target period and the judgment result of the vehicle abnormality as a result of analyzing the operation information collected from the target vehicle during the target period. The server 3 functions as a provider and transmits the created operation performance table to the management terminal 4. The management terminal 4 displays the operation performance table shown in FIG. 6 transmitted from the server 3.

When the server 3 performs a degradation or abnormality determination in S11 or S12, it transmits that information to the management terminal 4, as shown in FIG. 6.

The values of M3% and N3% used to determine the deterioration of the exhaust gas sensor 105 and to determine vehicle abnormalities described above may be set by a user such as an administrator. In this case, the user operates the operation unit 42 of the management terminal 4 to input the values of M3% and N3%. When the values of M3% and N3% are input, the management terminal 4 transmits the input values of M3% and N3% to the server 3. When the values of M3% and N3% are input from the management terminal 4, the server 3 uses the input values of M3% and N3% to reassess the deterioration and vehicle abnormalities.

The smaller the value of M3%, the less advanced the deterioration of the exhaust gas sensor 105 will be when it is determined that deterioration has occurred. The smaller the value of N3%, the less advanced the vehicle abnormality will be when it is determined that there is a vehicle abnormality. The degree of deterioration or vehicle abnormality that is notified to the administrator depends on the user's wishes, so by allowing the user to set M3% and N3%, it is possible to determine deterioration and vehicle abnormality according to the user's wishes.

According to the above-described embodiment, the server 3 can determine the deterioration of the exhaust gas sensor 105 based on the difference between the exhaust gas measurement value and the exhaust gas measurement value. This can prompt the user to replace the exhaust gas sensor 105, thereby enabling the exhaust gas to be measured with high accuracy.

According to the above-described embodiment, the server 3 determines the deterioration of the exhaust gas sensor 105 based on the difference between the exhaust gas measurement value and the exhaust gas estimate value at the same points A to J on the same driving route. This makes it possible to determine the deterioration of the exhaust gas sensor 105 with even greater accuracy.

According to the above-described embodiment, the deterioration of the exhaust gas sensor 105 is judged based on a comparison between the reference value for each of points A to J obtained when the driving route is driven for the first time and the judgment value for each of points A to J obtained when the driving route is driven for the second or subsequent time. The reference value is a value according to the individual difference of the exhaust gas sensor 105 and the individual difference of the vehicle 10 on which the exhaust gas sensor 105 is mounted. Therefore, the deterioration of the exhaust gas sensor 105 can be judged taking into account the variation in the measurement value due to the individual difference of the exhaust gas sensor 105 and the individual difference of the vehicle 10 on which the exhaust gas sensor 105 is mounted.

According to the above-described embodiment, the server 3 determines that the exhaust gas sensor 105 is degraded if the proportion of values determined to be abnormal values below the normal range on the travel route is M3% or more, so that the deterioration of the exhaust gas sensor 105 can be determined with even greater accuracy.

According to the above-described embodiment, the server 3 determines that there is a vehicle abnormality when the proportion of values determined to be abnormal above the normal range on the travel route is N3% or more, and is therefore able to distinguish between a vehicle abnormality and deterioration of the exhaust gas sensor 105.

According to the embodiment described above, the server 3 transmits the results of the deterioration judgment and vehicle abnormality judgment to the management terminal 4. This allows the management terminal 4 to be used to manage the vehicle 10.

According to the embodiment described above, the server 3 performs deterioration judgment and vehicle abnormality judgment using the values of M3% and N4% transmitted by the management terminal 4. This allows the user to set the values of M3% and N4%.

The present invention is not limited to the above-described embodiment, and can be modified, improved, etc. as appropriate. In addition, the material, shape, size, number, location, etc. of each component in the above-described embodiment are arbitrary as long as they can achieve the present invention, and are not limited.

According to the embodiment described above, the server 3 performs the deterioration judgment and the vehicle abnormality judgment based on the comparison of the judgment value for each point A to J created in S7 with the reference value for each point A to J created in S5, but this is not limited to this. The server 3 may perform the deterioration judgment and the vehicle abnormality judgment based only on the judgment value for each point A to J created in S7.

According to the embodiment described above, the server 3 judges the deterioration of the exhaust gas sensor 105 and the deterioration of the vehicle based on the proportion of times the exhaust gas measurement value is judged to be an abnormal value, but this is not limited to this. For example, if the exhaust gas measurement value is judged to be an abnormal value a predetermined number of times in succession, the deterioration of the exhaust gas sensor 105 and the deterioration of the vehicle may be judged.

According to the embodiment described above, the server 3 determines both the deterioration of the exhaust gas sensor 105 and the vehicle abnormality, but this is not limited to this. The server 3 may determine only the deterioration of the exhaust gas sensor 105.

According to the embodiment described above, the exhaust gas measurement values and operation information collected by the operation recording device 2 are transmitted to the server 3 via the wide area communication network 11, but this is not limited to the above. The operation recording device 2 may record the exhaust gas measurement values and operation information on a medium such as an SD card mounted in the media R/W 24, and transmit the values to the server 3 from the management terminal 4 by mounting the SD card in the management terminal 4. This allows deterioration of the exhaust gas sensor 105 to be determined even in an operation recording device 2 that does not have a wide area communication unit 21.

Here, the features of the exhaust gas sensor deterioration determination system and server embodiments according to the present invention described above are briefly summarized and listed below in [1] to [8].

[1]
An on-board device (2) that collects exhaust gas measurement values measured by an exhaust gas sensor (105) mounted on a vehicle (10) and operation information of the vehicle (10);
a server (3) for determining deterioration of the exhaust gas sensor (105);
The server (3)
an acquisition unit (33) that acquires the measurement values of the exhaust gas and the operation information collected by the vehicle-mounted device (2);
an estimation unit (33) that estimates an estimated value of the exhaust gas based on the operation information;
a deterioration determination unit (33) that determines deterioration of the exhaust gas sensor based on a difference between the estimated value of the exhaust gas and the measured value of the exhaust gas.

According to the exhaust gas sensor (105) deterioration determination system configured as in [1] above, deterioration of the exhaust gas sensor (105) can be determined based on the difference between the exhaust gas measurement value and the exhaust gas measurement value. This makes it possible to prompt replacement of the exhaust gas sensor (105), thereby enabling accurate exhaust gas measurement.

[2]
In the deterioration determination system (1) of the exhaust gas sensor according to [1],
The acquisition unit (33) acquires the measurement values of the exhaust gas at each of a plurality of points (A to J) on a predetermined driving route,
The estimation unit (33) estimates the estimated value of the exhaust gas for each of a plurality of points (A to J) on a predetermined traveling route,
the deterioration determination unit (33) determines a difference between the estimated value of the exhaust gas and the measured value of the exhaust gas for each of the plurality of points (A to J), and determines deterioration of the exhaust gas sensor (105) based on the difference determined for each of the plurality of points.
Exhaust gas sensor deterioration determination system (1).

According to the sensor deterioration determination system (1) configured as described above in [2], deterioration of the exhaust gas sensor (105) is determined based on the difference between the measured exhaust gas value and the estimated exhaust gas value at the same point (A to J) on the same driving route. This makes it possible to determine deterioration of the exhaust gas sensor (105) with even greater accuracy.

[3]
In the deterioration determination system (1) of the exhaust gas sensor according to [2],
a storage unit (32) that stores the difference for each of the plurality of points (A to J) obtained when the vehicle travels along the predetermined travel route for the first time as a reference value for each of the plurality of points (A to J);
the deterioration determination unit (33) determines deterioration of the exhaust gas sensor (105) based on a comparison between the difference for each of the plurality of points (A to J) obtained when the vehicle has traveled the predetermined travel route for the second or subsequent time, and the reference value for each of the plurality of points (A to J) stored in the memory unit (32).
Exhaust gas sensor deterioration determination system (1).

According to the exhaust gas sensor deterioration determination system (1) having the configuration of [3] above, the deterioration of the exhaust gas sensor (105) can be determined taking into account the variation in measurement values due to individual differences in the exhaust gas sensor (105) and the vehicle on which the exhaust gas sensor (105) is installed. This makes it possible to determine the deterioration of the exhaust gas sensor (105) with even greater accuracy.

[4]
In the deterioration determination system (1) of the exhaust gas sensor according to [2] or [3],
the deterioration determination unit (33) determines whether the measurement value of the exhaust gas at each of the plurality of points (A to J) is an abnormal value below a normal range, and determines that the exhaust gas sensor (105) is deteriorated when a rate at which the measurement value is determined to be the abnormal value below the normal range on the predetermined traveling route is equal to or greater than a first threshold value (M3%);
Exhaust gas sensor deterioration determination system (1).

According to the exhaust gas sensor deterioration determination system (1) configured as in [4] above, the deterioration determination unit (33) determines that the exhaust gas sensor (105) is deteriorated when the proportion of values determined to be abnormal values below the normal range on a specified driving route is equal to or greater than the first threshold value (M3%), so that deterioration of the exhaust gas sensor (105) can be determined with even greater accuracy.

[5]
In the deterioration determination system (1) of the exhaust gas sensor according to [4],
The deterioration determination unit (33) determines whether the measurement value of the exhaust gas at each of the plurality of points (A to J) is an abnormal value that is equal to or greater than the normal range, and determines that a vehicle abnormality has occurred when a ratio of the measurement value that is equal to or greater than the normal range on the predetermined travel route is equal to or greater than a second threshold value.
Exhaust gas sensor deterioration determination system (1).

According to the exhaust gas sensor deterioration determination system (1) configured as described above in [5], the deterioration determination unit (33) determines that there is a vehicle abnormality when the proportion of values determined to be abnormal values above the normal range on a specified driving route is equal to or greater than the second threshold value (N3%), so that it is possible to distinguish between a vehicle abnormality and deterioration of the exhaust gas sensor (105).

[6]
In the deterioration determination system (1) of the exhaust gas sensor according to [1],
A management terminal (4) having a display unit (43),
The server (3) has a providing unit (33) that provides the determination result by the deterioration determining unit (33) to the management terminal (4),
The management terminal (4) displays the judgment result provided by the providing unit (33) on the display unit (43).
Deterioration determination system (1).

According to the exhaust gas sensor deterioration determination system (1) configured as in [6] above, the providing unit (33) of the server (3) provides the determination result by the deterioration determination unit (33) to the management terminal (4). This makes it possible to manage the vehicle (10) using the management terminal (4).

[7]
In the deterioration determination system (1) of the exhaust gas sensor according to [4],
A management terminal (4) having an input unit (42) for inputting the first threshold value,
The deterioration determination unit (33) of the server (3) performs deterioration determination using the first threshold value inputted by the input unit (42) of the management terminal (4).
Deterioration determination system (1).

According to the configuration of [7] above, the first threshold can be set by the user.

[8]
an acquisition unit (33) that acquires exhaust gas measurement values measured by an exhaust gas sensor (105) mounted on a vehicle and operation information of the vehicle;
an estimation unit (33) that estimates an estimated value of the exhaust gas based on the operation information;
a deterioration determination unit (33) for determining deterioration of the exhaust gas sensor (105) based on a difference between the estimated value of the exhaust gas and the measured value of the exhaust gas,
Server (3).

According to the server (3) having the configuration of [8] above, the deterioration of the exhaust gas sensor (105) can be determined based on the difference between the exhaust gas measurement value and the exhaust gas measurement value. This makes it possible to prompt the replacement of the exhaust gas sensor (105), thereby enabling the exhaust gas to be measured with high accuracy.

1. Exhaust gas sensor deterioration determination system 2. Driving recorder (on-board device)
3 Server 4 Management terminal 10 Vehicle 105 Exhaust gas sensor 32 DB (storage unit)
33 CPU (acquisition unit, estimation unit, deterioration determination unit, provision unit)
42 Operation unit (input unit)
43 Display section A to J points

Claims (8)

An on-board device that collects exhaust gas measurement values measured by an exhaust gas sensor mounted on a vehicle and operation information of the vehicle;
a server for determining deterioration of the exhaust gas sensor;
The server,
an acquisition unit that acquires the measurement values of the exhaust gas and the operation information collected by the in-vehicle device;
an estimation unit that estimates the estimated value of the exhaust gas based on the operation information;
a deterioration determining unit that determines deterioration of the exhaust gas sensor based on a difference between the estimated value of the exhaust gas and the measured value of the exhaust gas. 2. The exhaust gas sensor deterioration determination system according to claim 1,
The acquisition unit acquires the measurement values of the exhaust gas at each of a plurality of points on a predetermined travel route,
The estimation unit estimates the estimated value of the exhaust gas for each of a plurality of points on a predetermined traveling route,
the deterioration determination unit determines a difference between the estimated value of the exhaust gas and the measured value of the exhaust gas for each of the plurality of points, and determines deterioration of the exhaust gas sensor based on the difference determined for each of the plurality of points.
Exhaust gas sensor deterioration determination system. 3. The exhaust gas sensor deterioration determination system according to claim 2,
a storage unit that stores the difference for each of the plurality of points obtained when the vehicle travels along the predetermined travel route for the first time as a reference value for each of the plurality of points;
the deterioration determination unit determines deterioration of the exhaust gas sensor based on a comparison between the difference for each of the plurality of points obtained when the vehicle travels the predetermined travel route for the second or subsequent time and the reference value for each of the plurality of points stored in the storage unit.
Exhaust gas sensor deterioration determination system. 4. The exhaust gas sensor deterioration determination system according to claim 2,
the deterioration determination unit determines whether the measurement value of the exhaust gas at each of the plurality of points is an abnormal value below a normal range, and determines that the exhaust gas sensor is deteriorated when a ratio of the measurement value determined to be the abnormal value below the normal range on the predetermined traveling route is equal to or greater than a first threshold value.
Exhaust gas sensor deterioration determination system. 5. The exhaust gas sensor deterioration determination system according to claim 4,
the deterioration determination unit determines whether the measurement value of the exhaust gas at each of the plurality of points is an abnormal value that is equal to or greater than the normal range, and determines that a vehicle abnormality has occurred when a ratio of the measurement value of the exhaust gas that is equal to or greater than the normal range on the predetermined travel route is equal to or greater than a second threshold value;
Exhaust gas sensor deterioration determination system. 2. The exhaust gas sensor deterioration determination system according to claim 1,
A management terminal having a display unit,
the server includes a providing unit that provides a result of the determination by the degradation determining unit to the management terminal;
the management terminal displays the determination result provided by the providing unit on the display unit.
Deterioration assessment system. 5. The exhaust gas sensor deterioration determination system according to claim 4,
a management terminal having an input unit for inputting the first threshold value,
the degradation determination unit of the server performs degradation determination using the first threshold value input by the input unit of the management terminal;
Deterioration assessment system. An acquisition unit that acquires exhaust gas measurement values measured by an exhaust gas sensor mounted on a vehicle and operation information of the vehicle;
an estimation unit that estimates the estimated value of the exhaust gas based on the operation information;
A deterioration determination unit that determines deterioration of the exhaust gas sensor based on a difference between the estimated value of the exhaust gas and the measured value of the exhaust gas.
server.

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