JP2021051637A - Model generation apparatus, data generation apparatus, model generation method, and data generation method - Google Patents

Abstract

To provide a model generation apparatus configured to allow a state of a vehicle to be easily grasped while suppressing the amount of data to be transmitted by the vehicle, a data generation apparatus, a model generation method, and a data generation method.SOLUTION: A data generation apparatus 2 which functions as a model generation apparatus includes: a time-series data acquisition unit 231 which acquires, as learning time-series data, time-series data on speed of a vehicle measured during traveling; learning frequency data acquisition unit 232 which acquires learning speed frequency data indicating an occurrence frequency distribution of speed in the learning time-series data, and learning acceleration frequency data indicating an occurrence frequency distribution of acceleration in the learning time-series data; and a model generation unit 235 which generates a machine learning model for outputting generation time-series data, which is time-series data of speed of the vehicle, in response to an input of speed frequency data and acceleration frequency data, by machine learning using the learning speed frequency data and the learning acceleration frequency data corresponding to the learning time-series data, as teacher data.SELECTED DRAWING: Figure 4

Description

The present invention relates to a model creation device, a data generation device, a model creation method, and a data generation method for generating data related to a vehicle.

There is known a system that acquires data such as vehicle speed and acceleration and manages the vehicle based on the acquired data (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-24887

In order to grasp the state of the vehicle, it is desirable that the system analyzes time series data composed of a large number of data that change with the passage of time. However, since the time-series data has a large data size, if the vehicle continues to transmit the time-series data, the load during communication is large. Therefore, there is a demand for a method that makes it easier to grasp the state of the vehicle while suppressing the amount of data transmitted by the vehicle.

Therefore, the present invention has been made in view of these points, and a model creation device, a data generation device, a model creation method, and a model creation device, a data generation device, a model creation method, and the like for easily grasping the state of the vehicle while suppressing the amount of data transmitted by the vehicle. The purpose is to provide a data generation method.

The model creation device according to the first aspect of the present invention includes a time-series data acquisition unit that acquires time-series data of the vehicle speed measured while the vehicle is running as learning time-series data, and the learning time-series. A learning frequency data acquisition unit that acquires learning speed frequency data showing the speed occurrence frequency distribution in the data, learning acceleration frequency data showing the acceleration occurrence frequency distribution in the learning time series data, and the learning frequency data acquisition unit. By machine learning the time-series data, the corresponding learning speed frequency data, and the learning acceleration frequency data as teacher data, the vehicle's speed frequency data and acceleration frequency data are input in response to the input of the speed frequency data and the acceleration frequency data. It has a model creation unit that creates a machine learning model that outputs generated time-series data that is time-series data of speed.

The model creation unit has the generation time series data output from the machine learning model when the learning speed frequency data and the learning acceleration frequency data are input to the machine learning model, and the learning speed frequency data. And the weight of the machine learning model may be updated based on the difference from the learning time series data corresponding to the learning acceleration frequency data.

The learning frequency data acquisition unit further acquires learning gradient data indicating the gradient of the place where the vehicle traveled while the learning time series data was acquired, and the model creation unit obtains the learning gradient data as the teacher data. The generation time series data output from the machine learning model when the learning speed frequency data, the learning acceleration frequency data, and the learning gradient data are input to the machine learning model, and the learning speed frequency data. , The weight of the machine learning model may be updated based on the difference between the learning acceleration frequency data and the learning time series data corresponding to the learning gradient data.

The model creation unit may specify the weight of the vehicle and create a plurality of the machine learning models corresponding to the specified weight.

The model creation device includes a generation frequency data acquisition unit that acquires generation speed frequency data and generation acceleration frequency data used for generating the generation time series data, and the generation speed frequency data and the generation. It may further have a data output unit that outputs the generated time series data output from the machine learning model by inputting the acceleration frequency data into the machine learning model.

The learning acceleration frequency data may include a plurality of acceleration frequency data corresponding to each of the plurality of speeds of the vehicle.

The data generation device of the second aspect of the present invention includes a frequency data acquisition unit that acquires frequency data of the speed of the vehicle and frequency data of acceleration measured while the vehicle is traveling, and a time for learning the speed of the vehicle. Input the speed frequency data of the vehicle and the acceleration frequency data of the vehicle into the machine learning model in which the series data, the corresponding speed frequency data for learning, and the acceleration frequency data for learning are machine-learned as teacher data. It has a data generation unit that generates generation time-series data, which is time-series data corresponding to the speed frequency data and the vehicle acceleration frequency data.

The model creation method of the third aspect of the present invention includes a step of acquiring time-series data of the vehicle speed measured while the vehicle is traveling, which is executed by a computer, as learning time-series data, and a learning time. The step of acquiring the learning speed frequency data showing the speed occurrence frequency distribution in the series data, the learning acceleration frequency data showing the acceleration occurrence frequency distribution in the learning time series data, and the learning time series data. By machine learning the corresponding learning speed frequency data and the learning acceleration frequency data as teacher data, the time series of the speed of the vehicle in response to the input of the speed frequency data and the acceleration frequency data. It has a step of creating a machine learning model that outputs generation time series data which is data.

The data generation method of the fourth aspect of the present invention includes a step of acquiring the frequency data of the speed of the vehicle and the frequency data of acceleration measured while the vehicle is running, which is executed by a computer, and learning of the speed of the vehicle. The speed frequency data of the vehicle and the acceleration frequency data of the vehicle are input to the machine learning model in which the time-series data for use, the corresponding speed frequency data for learning, and the acceleration frequency data for learning are machine-learned as teacher data. And the step of outputting the generation time series data output from the machine learning model in response to the input of the speed frequency data of the vehicle and the acceleration frequency data of the vehicle into the machine learning model. Have.

According to the present invention, it is possible to easily grasp the state of the vehicle while suppressing the amount of data transmitted by the vehicle.

It is a figure for demonstrating the outline of a data generation system. It is a figure for demonstrating the outline of a data generation system. It is a figure which shows the outline of time series data and frequency data. It is a figure which shows the structure of the data generation apparatus. It is a figure which shows the outline of the process which the model creation part creates a machine learning model composed of a conditional VAE. It is a figure which shows the process which a data generation part generates time series data using a machine learning model. It is a flowchart which shows the flow of processing in a data generation apparatus. It is a figure which shows the structure of the data generation apparatus at the time of creating the learning time series data and learning frequency data. It is a figure which shows the outline of the method of creating the learning time series data and learning frequency data. It is a figure which shows the structure of the data generation apparatus 2 which the model making part has a low frequency passing filter. It is a figure which shows the structure of the data generation apparatus 2 which can update a machine learning model based on an evaluation result. It is a figure which shows the structure of the model making apparatus. It is a figure which shows the Example which created the time series data from the frequency data using the data generation apparatus which concerns on this Embodiment.

[Overview of data generation system S]
1 and 2 are diagrams for explaining the outline of the data generation system S. The data generation system S is a system for generating time-series data of the parameters based on the frequency data of various parameters measured in the vehicle T. The data generation system S includes a data collection device 1 and a data generation device 2. The data generation device 2 is a device that generates time series data based on frequency data using a machine learning model. The data generation device 2 also functions as a model creation device for creating a machine learning model. The machine learning model is configured to include, for example, a conditional VAE (Variational Auto Encoder) or a conditional GAN (Generative Adversarial Networks).

FIG. 3 is a diagram showing an outline of time series data and frequency data. As shown in FIG. 3A, the time-series data is data showing the values of parameters that change with time, and is composed of, for example, the value of the speed of the vehicle T every second. As shown in FIG. 3B, the frequency data is data showing the distribution of the frequency at which a plurality of values that can be assumed as parameter values occur within a predetermined period. The frequency data may be data showing the distribution of the frequency in which the values obtained by differentiating the parameters to the first order occur.

When the parameter is the speed of the vehicle T, the frequency data is N km (N) per hour, such as the time when the state of 1 km / h occurs within a unit time (for example, 1 hour), the time when the state of 2 km / h occurs, and the like. Is data indicating the time or rate at which the state (an integer of 0 or more) occurred. When the parameter is the speed of the vehicle T, the frequency data may be data indicating the time or rate at which a predetermined acceleration occurs within a unit time. The acceleration has a positive value while the vehicle T is accelerating, and the acceleration has a negative value while the vehicle T is decelerating. The acceleration frequency data may include a plurality of acceleration frequency data corresponding to each of the plurality of speeds of the vehicle T.

The parameters measured in the vehicle T are, for example, the speed of the vehicle T, the acceleration of the vehicle T, the temperature of the cooling water used in the vehicle T, the temperature of the oil used in the vehicle T, the accelerator opening of the vehicle T, and the vehicle. At least one of the vibration amounts of T. By analyzing the time-series data of such parameters, the manager of the vehicle T can obtain various information such as the fuel consumption of the vehicle T, the degree of deterioration of the vehicle T, and the quality of driving by the driver of the vehicle T. it can. However, when only frequency data can be obtained from the vehicle T, it is difficult to obtain such information.

Therefore, the data generation system S creates a machine learning model by machine learning (for example, deep learning) using the time-series data and the frequency data of the parameters measured in the vehicle T as teacher data, and uses the created machine learning model. It makes it possible to generate time series data based on the frequency data obtained from the vehicle T. By analyzing the time-series data generated by the data generation system S, the manager of the vehicle T can obtain various information such as the fuel consumption, the degree of deterioration, and the quality of driving of the vehicle T.

Hereinafter, an outline of the data generation system S will be described with reference to FIGS. 1 and 2. The data collecting device 1 is a device that acquires parameter data measured in a large number of vehicles T via a network N, and is, for example, a computer. The data generation device 2 is a computer that creates a machine learning model in which time-series data acquired from the vehicle T via the data collection device 1 and frequency data corresponding to the time-series data are machine-learned as teacher data. The data generation device 2 generates time series data based on the frequency data obtained from the vehicle T by using the created machine learning model.

FIG. 1 is a diagram showing the operation of the data generation system S while the data generation device 2 performs machine learning to create a machine learning model. The data collecting device 1 acquires measurement data of a predetermined parameter (for example, speed) from the vehicle T registered in advance ((1) in FIG. 1). The data collecting device 1 transmits the time-series data of the acquired measurement data to the data generating device 2 ((2) in FIG. 1).

The data generation device 2 is a machine that generates frequency data based on the time-series data received from the data collection device 1, uses the time-series data and the frequency data as teacher data, and outputs the time-series data when the frequency data is input. Create a learning model ((3) in FIG. 1). Instead of the data generation device 2 generating the frequency data, the data collection device 1 may transmit the time series data and the frequency data to the data generation device 2.

Subsequently, with reference to FIG. 2, the operation after the data generation device 2 creates the machine learning model will be described. The vehicle T transmits the frequency data of the measured parameters to the data collecting device 1 ((4) in FIG. 2). The data collecting device 1 transmits the frequency data received from the vehicle T to the data generating device 2 ((5) in FIG. 2). The data generation device 2 inputs the received frequency data into the machine learning model and generates the time series data by acquiring the time series data output from the machine learning model ((6) in FIG. 2). The data generation device 2 transmits the generated time-series data to the data collection device 1 ((7) in FIG. 2).

Through the above flow, a user such as the manager of the vehicle T using the data generation device 2 can acquire time-series data of desired parameters based on the frequency data. The data generation device 2 may transmit the generated time-series data to any computer other than the data collection device 1, display it on a display, or print it.

[Configuration and operation of data generator 2]
FIG. 4 is a diagram showing the configuration of the data generation device 2. The data generation device 2 includes a communication unit 21, a storage unit 22, and a control unit 23. The control unit 23 includes a time series data acquisition unit 231, a learning frequency data acquisition unit 232, a generation frequency data acquisition unit 233, a data output unit 234, a model creation unit 235, and a data generation unit 236. .. When the data generation device 2 does not have the generation frequency data acquisition unit 233, the data output unit 234, and the data generation unit 236, the data generation device 2 functions as a model creation device for creating the machine learning model M.

The communication unit 21 includes a communication interface for transmitting and receiving data to and from the data collection device 1 or other external device via the network N. The communication unit 21 notifies the control unit 23 of the data received from the external device, and transmits the data input from the control unit 23 to the external device.

The storage unit 22 includes a storage medium such as a ROM (Read Only Memory), a RAM (Random Access Memory), and a hard disk. The storage unit 22 stores a program executed by the control unit 23. Further, the storage unit 22 temporarily stores the time series data and the frequency data received from the data collection device 1.

The control unit 23 is, for example, a CPU (Central Processing Unit). By executing the program stored in the storage unit 22, the control unit 23 executes a time-series data acquisition unit 231, a learning frequency data acquisition unit 232, a generation frequency data acquisition unit 233, a data output unit 234, and a model creation unit. It functions as 235 and data generation unit 236.

The time-series data acquisition unit 231 acquires the time-series data of the parameters measured while the vehicle T is traveling as the learning time-series data. The time-series data acquisition unit 231 acquires, for example, time-series data of the vehicle speed measured while the vehicle T is traveling as learning time-series data. The time-series data acquisition unit 231 inputs the acquired learning time-series data to the model creation unit 235.

The learning frequency data acquisition unit 232 acquires the learning frequency data corresponding to the learning time series data acquired by the time series data acquisition unit 231. The learning frequency data acquisition unit 232 acquires the learning frequency data via, for example, the communication unit 21, but the learning frequency data acquisition unit 232 creates the learning frequency data based on the learning time series data. Thereby, the learning frequency data may be acquired from the learning time series data. The learning frequency data acquisition unit 232 includes, for example, learning frequency data showing the occurrence frequency distribution of parameters corresponding to the learning time series data, and learning frequency data showing the occurrence frequency distribution of the first-order differential value of the parameters. To get.

When the learning time-series data is the speed time-series data, the learning frequency data acquisition unit 232 includes the learning speed frequency data showing the frequency occurrence frequency distribution of the speed in the learning time-series data and the learning time-series data. Acquires learning acceleration frequency data showing the acceleration occurrence frequency distribution. The learning frequency data acquisition unit 232 inputs the acquired learning frequency data to the model creation unit 235.

The generation frequency data acquisition unit 233 acquires the generation frequency data used for generating the time series data using the machine learning model M. In the present specification, the time series data generated by using the machine learning model M is referred to as the generated time series data. The generation frequency data acquisition unit 233 acquires the generation speed frequency data and the generation acceleration frequency data from the data collection device 1 via, for example, the communication unit 21. The generation frequency data acquisition unit 233 inputs the acquired generation frequency data to the data generation unit 236.

The data output unit 234 outputs the generation time series data output from the machine learning model M based on the generation frequency data input by the generation frequency data acquisition unit 233 to the data generation unit 236. The data output unit 234 transmits, for example, the generation time series data input from the data generation unit 236 to an external device via the communication unit 21.

The model creation unit 235 creates a machine learning model M, and stores the weight of the created machine learning model M in the storage unit 22. The model creation unit 235 may store the weight in a memory (not shown) included in the model creation unit 235.

The model creation unit 235 uses machine learning of the learning time-series data and the corresponding learning frequency data as teacher data to generate time-series data corresponding to the frequency data in response to the input of the frequency data. Create a machine learning model M that outputs certain generated time series data. The learning time-series data is the vehicle T speed time-series data, the learning frequency data is the vehicle T speed frequency data and the acceleration frequency data, and the generated time-series data is the speed time-series data. In some cases, the machine learning model M outputs the generated time-series data, which is the time-series data of the speed of the vehicle T, in response to the input of the speed frequency data and the acceleration frequency data.

The data generation unit 236 generates generation time series data by inputting the generation frequency data input from the generation frequency data acquisition unit 233 into the machine learning model M. When the generation frequency data input from the generation frequency data acquisition unit 233 is the speed frequency data of the vehicle T and the acceleration frequency data, the data generation unit 236 determines the speed frequency data of the vehicle T and the vehicle T. By inputting the acceleration frequency data, the time-series data of the speed output from the machine learning model M is generated as the generation time-series data. The data generation unit 236 can output the generated time-series data to the outside by inputting it to the data output unit 234.

[How to create machine learning model M]
FIG. 5A is a diagram showing an outline of a process in which the model creation unit 235 creates a machine learning model M composed of a conditional VAE as an example of the machine learning model M. FIG. 5B is a diagram showing a process in which the data generation unit 236 generates time series data using the machine learning model M.

As shown in FIG. 5, the machine learning model M is composed of a deep neural network (DNN) as an example. The DNN has a plurality of layers between the input layer and the output layer, and variable weights are provided for each of the plurality of nodes included in each layer. The weight before learning by the machine learning model M is an initial value.

As shown in FIG. 5A, the model creation unit 235 has a machine learning model M-1 in which a pair of input learning time series data and learning frequency data is input, a latent variable vector z, and learning frequency data. It is composed of the input machine learning model M-2, and the generated time series data output from the machine learning model M-2 is compared with the learning time series data corresponding to the input learning frequency data.

When the model creation unit 235 inputs the learning speed frequency data and the learning acceleration frequency data into the machine learning model M-2 (or machine learning model M-1), the model learning model M-2 (or machine learning model M-1) The weight of the machine learning model M-1 is updated based on the difference between the generated time-series data output from -1) and the learning time-series data corresponding to the learning speed frequency data and the learning acceleration frequency data. ..

The model creation unit 235 back-propagates the generated time-series data and updates the weights of the nodes on the back-propagated route, for example, when the difference between the generated time-series data and the learning time-series data is equal to or greater than the threshold value. .. The model creation unit 235 input the training frequency data into the machine learning model M-2 (or machine learning model M-1) until the difference between the generated time series data and the training time series data becomes less than the threshold value. The comparison between the generated time series data generated by and the training time series data and the update of the weight are repeated. The model creation unit 235 executes the above processing using a large number of pairs of learning frequency data and learning time series data, thereby performing the machine learning model M-3 (machine learning model M-2) shown in FIG. 5B. Create a model that is substantially the same).

After the model creation unit 235 updates the machine learning model M-1 and completes it as the machine learning model M-3, the data generation unit 236 generates frequency data (generation) acquired from the vehicle T, as shown in FIG. 5B. By inputting the frequency data) into the machine learning model M-3, the machine learning model M-3 outputs the generated time-series data corresponding to the input frequency data.

[Process flow in data generator 2]
FIG. 6 is a flowchart showing a processing flow in the data generation device 2. The flowchart shown in FIG. 6 starts from the time when the data generation device 2 receives an instruction to start creating the machine learning model M.

When the model creation unit 235 receives an instruction to create the machine learning model M, the model creation unit 235 acquires the learning time series data from the time series data acquisition unit 231 (step S1). Further, the model creation unit 235 acquires the learning frequency data from the learning frequency data acquisition unit 232 (step S2). The order in which steps S1 and S2 are executed is arbitrary, and the model creation unit 235 may acquire the learning time series data and the learning frequency data at the same time. The model creation unit 235 updates the machine learning model M by machine learning a set of learning time series data and learning frequency data as teacher data (step S13). Specifically, the model creation unit 235 updates the weight of the machine learning model M stored in the storage unit 22.

The model creation unit 235 evaluates the performance of the updated machine learning model M, and determines whether or not the evaluation result is equal to or higher than the reference level (step S14). In the model creation unit 235, for example, the degree of correlation between the generated time series data output from the machine learning model M when the frequency data is input to the machine learning model M and the time series data corresponding to the frequency data is equal to or higher than the threshold value. In some cases, it is determined that the evaluation result is above the reference level.

When the model creation unit 235 determines that the evaluation result has not reached the reference level (NO in step S14), the model creation unit 235 returns to step S11 and repeats machine learning using further learning time series data and learning frequency data. .. When the model creation unit 235 determines that the evaluation result has reached the reference level (YES in step S14), the model creation unit 235 ends the update of the machine learning model M (step S15).

After that, when the data generation unit 236 acquires the generation frequency data for generating the time series data (step S16), the data generation unit 236 inputs the generation frequency data into the machine learning model M (step S17). The data generation unit 236 outputs the generation time series data output from the machine learning model M (step S18).

[Use gradient data as teacher data]
In the above description, the case where the model creation unit 235 creates the machine learning model M using the speed learning time series data, the speed learning frequency data, and the acceleration learning frequency data is illustrated. Part 235 may create a machine learning model M using other data.

For example, the learning frequency data acquisition unit 232 further acquires the learning gradient data indicating the gradient of the place where the vehicle T traveled while the learning time series data is acquired, and the model creation unit 235 learns. Machine learning may be performed by further using the gradient data. The training gradient data may include at least one of time series data and frequency data.

In this case, the model creation unit 235 receives the generation time series data output from the machine learning model M when the learning speed frequency data, the learning acceleration frequency data, and the learning gradient frequency data are input to the machine learning model M. The weight of the machine learning model M is updated based on the difference between the learning speed frequency data, the learning acceleration frequency data, and the learning time series data corresponding to the learning gradient frequency data. As described above, the model creation unit 235 further uses the data of the plurality of parameters as the teacher data, so that the accuracy of the generated time series data output by the model creation unit 235 is improved. In particular, the model creation unit 235 uses gradient data closely related to velocity and acceleration to improve the accuracy of the generated time series data.

[Use water temperature, oil temperature, etc. as teacher data]
The model creation unit 235 may create a machine learning model M by using time series data and frequency data of a plurality of parameters having different tendencies of change rates as teacher data. The first parameter is, for example, at least one of the speed and acceleration of the vehicle T, and the second parameter is, for example, at least one of the temperature of the cooling water and the temperature of the oil used in the vehicle T. The oil is, for example, engine oil, brake oil, mission oil, and differential oil.

The time-series data acquisition unit 231 acquires the time-series data of the first parameter measured while the vehicle T is traveling as the learning time-series data. The learning frequency data acquisition unit 232 shows the first learning frequency data showing the occurrence frequency distribution of the first parameter in the learning time series data, and the occurrence frequency distribution of the second parameter whose change rate is slower than the first parameter. Acquire the second learning frequency data.

The model creation unit 235 includes the learning time-series data of the first parameter acquired by the time-series data acquisition unit 231 and the first learning frequency data and the second learning frequency data acquired by the learning frequency data acquisition unit 232. Is a machine that outputs the generation time series data, which is the time series data of the first parameter, in response to the input of the occurrence frequency data of the first parameter and the occurrence frequency data of the second parameter by machine learning as the teacher data. Create a learning model M.

In this case, the model creation unit 235 receives the generation time series data output from the machine learning model M when the first learning frequency data and the second learning frequency data are input to the machine learning model M, and the first learning frequency data. The weight of the machine learning model M is updated based on the difference between the frequency data and the learning time-series data corresponding to the second learning frequency data. The model creation unit 235 may further use the frequency data of the first parameter value and the first derivative value of the second parameter value as teacher data.

After the model creation unit 235 creates the machine learning model M, the generation frequency data acquisition unit 233 performs the first generation frequency data and the second generation frequency data corresponding to the first parameter used for generating the generation time series data. Acquire the second generation frequency data corresponding to the parameter. The data generation unit 236 inputs the first generation frequency data and the second generation frequency data acquired by the generation frequency data acquisition unit 233 into the machine learning model M, and inputs the first parameter output from the machine learning model M. Get the generated time series data. The data output unit 234 outputs the generation time series data acquired by the data generation unit 236.

The model creation unit 235 machine-learns the time-series data and the frequency data of a plurality of parameters having different tendencies of change rates as teacher data to create a machine learning model M, whereby a plurality of different first parameters are created. Even if the frequency data corresponding to the time series data is similar, the frequency data of the second parameter may be different. Therefore, by using the frequency data of the second parameter together, the accuracy of the generated time series data is improved as compared with the case where only the frequency data of the first parameter is input to the machine learning model M.

When the second parameter is the temperature of the cooling water or oil, the frequency of the low temperature is high while the vehicle T is traveling at a low speed, and the frequency of the high temperature is high when the vehicle T continues to travel at a high speed. Therefore, by also using the frequency data of the temperature of the cooling water or the oil, the data generation device 2 can generate time-series data in which the tendency of the change in the speed of the vehicle T is more reflected.

[Use of multiple machine learning models M]
If the weight of the vehicle T is different, the speed change pattern may be different. When the data generation unit 236 uses the machine learning model M machine-learned using the teacher data measured by the vehicle T having a small weight even though the weight of the vehicle T to generate the time series data is large, The probability that appropriate generated time series data cannot be output increases.

Therefore, the model creation unit 235 may specify the weight of the vehicle T and create a plurality of machine learning models M corresponding to the specified weight. The model creation unit 235 identifies the weight of the vehicle T based on, for example, the identification information (for example, the vehicle body number) of the vehicle T or the information indicating the weight acquired by the time series data acquisition unit 231 together with the learning time series data.

The model creation unit 235 executes machine learning of the first machine learning model M when the weight of the vehicle T from which the learning time series data and the learning frequency data used as the teacher data are acquired is in the first range. Then, when the weight of the vehicle T is in the second range different from the first range, the machine learning of the second machine learning model M is executed. The number of machine learning models M created by the model creation unit 235 is arbitrary, and the model creation unit 235 may create three or more machine learning models M.

The data generation unit 236 identifies the weight of the vehicle T based on the identification information of the vehicle T or the information indicating the weight acquired by the generation frequency data acquisition unit 233 together with the generation frequency data. The data generation unit 236 acquires the generation time series data by inputting the generation frequency data into the machine learning model M corresponding to the specified weight. In this way, by using the plurality of machine learning models M corresponding to the weight of the vehicle T by the data generation device 2, the accuracy of the time series data generated based on the frequency data can be improved.

[Automatic generation of learning data]
In order to improve the performance of the machine learning model M, it is desirable that there is a large amount of teacher data. However, it takes a long time to acquire a large amount of data measured in the vehicle T. Therefore, the data generation device 2 may create a plurality of learning time series data and a plurality of learning frequency data by using the time series data based on the data measured in the vehicle T.

FIG. 7 is a diagram showing a configuration of a data generation device 2 when creating learning time series data and learning frequency data. The data generation device 2 shown in FIG. 7 has a learning time series data creation unit 237 and a learning frequency data creation unit 238, and does not have a learning frequency data acquisition unit 232. Unlike the device 2, it is the same in other respects.

The learning time-series data creation unit 237 divides the time-series data actually measured in the vehicle T acquired by the time-series data acquisition unit 231 to create a plurality of divided time-series data, and creates a plurality of divided time-series. Create learning time series data by rearranging multiple selected time series data selected from the data. The learning time-series data creation unit 237 inputs the created learning time-series data to the learning frequency data creation unit 238. Further, the learning time-series data creation unit 237 inputs the created learning time-series data to the model creation unit 235.

The learning frequency data creation unit 238 creates learning frequency data showing the frequency distribution of parameters in the learning time series data input from the learning time series data creation unit 237. The learning frequency data creation unit 238 inputs the created learning frequency data to the model creation unit 235.

The model creation unit 235 performs machine learning using the learning time series data input from the learning time series data creation unit 237 and the learning frequency data input from the learning frequency data creation unit 238 as teacher data. Update the weights of the machine learning model M. The model creation unit 235 may also use the actually measured time series data acquired by the time series data acquisition unit 231 and the frequency data corresponding to the actually measured time series data as teacher data.

FIG. 8 is a diagram showing an outline of a method of creating learning time series data and learning frequency data. FIG. 8A is a diagram showing an example of actually measured time series data acquired by the time series data acquisition unit 231. FIG. 8B shows an example of learning time-series data created by dividing the actually measured time-series data shown in FIG. 8A and rearranging a part of the divided plurality of divided time-series data. It is a figure. In FIG. 8B, among the divided time series data A to J in FIG. 8A, the learning time series data arranged in the order of H, D, I, A, and F, J, C, B The learning time series data arranged in the order of, C is shown. FIG. 8 (c) is a diagram showing an example of learning frequency data created based on the learning time series data shown in FIG. 8 (b).

The learning time series data creation unit 237 creates a plurality of divided time series data by dividing the actually measured time series data when the value of the parameter in the actually measured time series data is 0. Then, the learning time series data creation unit 237 divides the time series from the time when the value of the parameter in the actually measured time series data changes from 0 to a value larger than 0 to the time when the value larger than 0 changes to 0. Let it be data (for example, time series data indicated by reference numerals A to J in FIG. 8A). By creating the divided time series data in this way by the learning time series data creation unit 237, when a plurality of divided time series data are combined, it is possible to prevent the data from suddenly changing at the time of combination. Therefore, the learning time-series data creation unit 237 can arrange any divided time-series data in any order among the created plurality of divided time-series data.

The learning frequency data creation unit 238 identifies the occurrence frequency distribution of parameter values (for example, the speed of the vehicle T) included in the learning time series data created by the learning time series data creation unit 237. The first learning frequency data (for example, learning speed frequency data) is created. At that time, the learning frequency data creation unit 238 identifies the occurrence frequency distribution of the value (for example, the acceleration of the vehicle T) included in the time series data obtained by first-order differentiation of the learning time series data. A second learning frequency data (for example, learning acceleration frequency data) different from the one learning frequency data may be created. By creating the learning frequency data in this way by the learning frequency data creation unit 238, it is possible to create a large number of learning frequency data from one learning time series data.

The learning time-series data creation unit 237 may create a plurality of learning time-series data by rearranging a plurality of selected time-series data of the same combination in a plurality of different orders. Even if the training time series data is created based on the same plurality of selected time series data, the period between the selected time series data (the period when the value of the time series data is 0) is different. , The learning frequency data creation unit 238 can create different learning frequency data from each learning time series data.

When the period between the plurality of selected time series data is the same, that is, when the period when the value of the time series data is 0 is the same, the learning frequency data creation unit 238 is based on the plurality of learning time series data. The learning time series frequency data to be created will be the same. In this case, when the data generation unit 236 inputs one generation time series frequency data into the machine learning model M, a plurality of generation time series data candidates may be generated. Even in such a case, by using the learning time series data and the learning frequency data of other parameters together, the machine learning model M can select the optimum generation time series from a plurality of generation time series data candidates. It is possible to output data. By having the learning time series data creation unit 237 and the learning frequency data creation unit 238 having such a configuration, it is possible to maintain the accuracy of the generated time series data while increasing the number of learning frequency data.

[Optimization by filter]
When the model creation unit 235 adjusts the weight based on the difference between the generated time series data output from the machine learning model M and the time series data corresponding to the frequency data input to the machine learning model M, the generated time series Due to the presence of high frequency components in the data, the difference may become too large and the weights may be adjusted excessively. Therefore, the model creation unit 235 may further have a low frequency passing filter that removes frequency components equal to or higher than the threshold value (that is, the cutoff frequency) in the generated time series data output by the machine learning model M.

FIG. 9 is a diagram showing a configuration of a data generation device 2 in which the model creation unit 235 has a low frequency pass filter F. The model creation unit 235 determines the difference between the generated time series data output from the machine learning model M when the training frequency data is input to the machine learning model M and the learning time series data corresponding to the learning frequency data. Based on this, the characteristics of the low frequency pass filter F are updated. The model creation unit 235 changes the coefficient or configuration of the low frequency pass filter F so as to lower the cutoff frequency of the low frequency pass filter F, for example, when the difference is equal to or greater than a predetermined value.

However, if the cutoff frequency of the low-frequency pass filter F becomes too low, the generated time-series data becomes useless for the purpose of analysis using the generated time-series data. Therefore, the model creation unit 235 acquires information indicating the purpose of use from the user who uses the generated time-series data, and the cutoff frequency becomes higher than the minimum frequency stored in advance in the storage unit 22 in association with the acquired purpose of use. You may do so.

For example, when the generated time-series data is the speed time-series data, the fuel consumption of the vehicle T can be specified by analyzing the generated time-series data. It is also possible to evaluate the driving skill of the driver by analyzing the generated time series data.

When evaluating a driver's driving skill, the importance of information indicating small fluctuations in speed is considered to be lower than when identifying fuel consumption. Therefore, the model creation unit 235 sets the cutoff frequency when the generated time series data indicating the speed of the vehicle T is used for specifying the fuel consumption, and the cutoff frequency when the generated time series data is used for the evaluation of the driving skill. Also raise. In this way, the model creation unit 235 outputs the generated time series data suitable for the purpose of use of the generated time series data by changing the characteristics of the low frequency passing filter F according to the purpose of use of the machine learning model M. Can be done.

When the low frequency pass filter F is provided after the machine learning model M, the model creation unit 235 generates the output from the low frequency pass filter F when the training frequency data is input to the machine learning model M. The weight of the machine learning model M may be updated based on the difference between the series data and the learning time series data corresponding to the training frequency data. By doing so, the model creation unit 235 can optimize the weight of the machine learning model M when the low frequency passing filter F is used.

If the model creation unit 235 updates the characteristics of the low-frequency passing filter F after determining the weight of the machine learning model M, the weight of the machine learning model M will be added to the updated characteristics of the low-frequency passing filter F. There may be cases where it is not optimal. Therefore, the model creation unit 235 may sequentially update the characteristics of the low-frequency pass filter F and update the weights of the machine learning model M.

Specifically, when the model creation unit 235 updates the weights of the machine learning model M, the generated time series data output from the machine learning model M whose weights have been updated and the frequency data input to the machine learning model M. The characteristics of the low frequency pass filter F are updated based on the difference from the time series data corresponding to. Subsequently, the model creation unit 235 determines the difference between the generated time series data output by the machine learning model M and the time series data output from the low frequency passing filter F in a state where the characteristics of the low frequency passing filter F are updated. Based on this, the weight of the machine learning model M is updated. The model creation unit 235 repeats these processes until the difference between the generated time-series data and the time-series data corresponding to the frequency data input to the machine learning model M becomes a predetermined size or less, thereby performing machine learning. The weight of the model M and the characteristics of the low frequency pass filter F can be optimized.

[Update of weights based on evaluation of machine learning model M]
Assuming that the model creation unit 235 updates the weight of the machine learning model M based on the difference between the generated time series data output by the machine learning model M and the time series data corresponding to the frequency data input to the machine learning model M. However, the generated time-series data output by the machine learning model M with updated weights is not always in the optimum state for the purpose of using the time-series data. For example, when analyzing the fuel consumption of the vehicle T based on the speed generation time series data, it is preferable that the difference between the fuel consumption specified based on the generation time series data and the actual fuel consumption is small. Therefore, the data generation device 2 updates the weight of the machine learning model M so that this difference becomes small.

FIG. 10 shows a configuration of a data generation device 2 capable of evaluating whether or not the machine learning model M is suitable for the purpose of use of the generated time series data and updating the machine learning model M based on the evaluation result. It is a figure which shows. The data generation device 2 shown in FIG. 10 is different from the data generation device 2 shown in FIG. 4 in that it further includes a model evaluation unit 239, and is the same in other respects. The model creation unit 235 may include the model evaluation unit 239.

The model evaluation unit 239 outputs from the machine learning model M in which the first information corresponding to the change in the state of the predetermined member of the vehicle T during the period in which the predetermined time series data is measured and the predetermined time series data are input. The result of evaluating the machine learning model M based on the difference from the second information corresponding to the change in the state of the predetermined member T specified based on the generated time series data is output to the model creation unit 235. .. The predetermined member is a member whose state changes as the vehicle T travels, and is, for example, a fuel, a diesel particulate filter (DPF), various oils, and a battery. The predetermined member is set by, for example, a user who uses the data generation system S (for example, the manager of the vehicle T), and is acquired by the model creation unit 235 or the model evaluation unit 239 from an external device. The model creation unit 235 or the model evaluation unit 239 may acquire the purpose of use of the generated time series data from an external device and specify a predetermined member based on the acquired purpose of use.

The model evaluation unit 239 may create the first information based on the predetermined time series data acquired by the time series data acquisition unit 231, or may acquire the first information from an external device. The predetermined time-series data may be the learning time-series data acquired by the time-series data acquisition unit 231 or other time-series data acquired by the generation frequency data acquisition unit 233.

The model creation unit 235 updates the weight of the machine learning model M based on the evaluation result input from the model evaluation unit 239. Specifically, the model creation unit 235 updates the weight of the machine learning model M when the evaluation result is less than the reference level set by the user, and the machine learning model M when the evaluation result is equal to or higher than the reference level. Do not update the weight of. The model creation unit 235 updates the weight of the machine learning model M when the difference between the first information and the second information is larger than the reference value, and adds the weight of the machine learning model M when the difference is equal to or less than the reference value. You may not update it. The model creation unit 235 repeats the process of updating the weight of the machine learning model M and calculating the difference until the difference becomes equal to or less than the reference value.

As an example, the time-series data acquisition unit 231 acquires the time-series data of the speed of the vehicle T and the time-series data of the acceleration as the predetermined time-series data, and the learning frequency data acquisition unit 232 becomes the predetermined time-series data. It is assumed that the speed frequency data and the acceleration frequency data of the vehicle T are acquired as the corresponding predetermined frequency data. In this case, the model evaluation unit 239 outputs the fuel consumption (corresponding to the first information) specified based on the predetermined time series data and the predetermined frequency data from the machine learning model M when the predetermined frequency data is input to the machine learning model M. The result of evaluating the machine learning model M based on the difference from the fuel consumption (corresponding to the second information) specified based on the generated time series data is output.

The model evaluation unit 239 raises the evaluation of the machine learning model M as the difference between the first information and the second information is smaller, and lowers the evaluation of the machine learning model M as the difference is larger. The model creation unit 235 updates the weight of the machine learning model M based on the difference between the fuel consumption as the first information and the fuel consumption as the second information specified by the model evaluation unit 239.

The model evaluation unit 239 acquires from an external device (for example, the data collecting device 1) the state of change of a predetermined member while the vehicle T travels during the period when the frequency data to be input to the machine learning model M is acquired by the vehicle T. You may. When the predetermined member is fuel, the model evaluation unit 239 acquires information indicating the fuel consumption calculated based on the distance traveled by the vehicle T and the amount of fuel reduction (that is, consumption) during the test period. .. Further, the model evaluation unit 239 is based on the history of the speed of the vehicle T specified by the generated time series data output from the machine learning model M when the frequency data acquired during the period is input to the machine learning model M. And calculate the fuel consumption. The model evaluation unit 239 compares the acquired actual fuel consumption of the vehicle T with the calculated fuel consumption, and outputs an evaluation result corresponding to the difference.

The vehicle T has a diesel engine, the predetermined time-series data is the time-series data indicating the change in the speed of the vehicle T, and the predetermined frequency data is the speed occurrence frequency distribution and the acceleration occurrence frequency distribution of the vehicle T. In the case of the data indicating, the model evaluation unit 239 may evaluate the machine learning model M based on the state of the diesel particulate filter (hereinafter referred to as DPF).

Specifically, the model evaluation unit 239 describes the first information corresponding to the change in the DPF state within the period in which the predetermined time series data is measured, and the DPF state specified based on the generated time series data. The result of evaluating the machine learning model M based on the difference from the second information corresponding to the change is output. The information corresponding to the change in the state of the DPF is, for example, information indicating the amount of particulate matter (PM) accumulated in the DPF. Also in this case, the model creation unit 235 updates the weight of the machine learning model M based on the difference between the first information and the second information. The state of the DPF and the speed of the vehicle T have a high degree of correlation. For example, when the vehicle T travels at a low speed for a long period of time, particulate matter is likely to be accumulated in the DPF. Therefore, the model creation unit 235 updates the weight of the machine learning model M using the evaluation result based on the state of the DPF having a high degree of correlation with the speed of the vehicle T, so that the accuracy of the machine learning model M is improved.

Changes in fuel consumption and DPF conditions are also affected by changes in the slope of the road on which vehicle T travels. Therefore, even if the model creation unit 235 further acquires predetermined gradient frequency data indicating the gradient frequency of the place where the vehicle T has traveled as teacher data while the predetermined time series data is acquired, and performs machine learning. Good. In this case, the model creation unit 235 supplies the machine learning model M with the generation time series data output from the machine learning model M when the predetermined speed frequency data, the predetermined acceleration frequency data, and the predetermined gradient frequency data are input to the machine learning model M. The weight of the machine learning model M is updated based on the difference between the predetermined velocity frequency data, the predetermined acceleration frequency data, and the predetermined time series data corresponding to the predetermined gradient frequency data. Then, the model evaluation unit 239 evaluates the machine learning model M based on the change in the fuel consumption or the state of the DPF.

[Model evaluation device]
The function of the model evaluation unit 239 may be realized in a model evaluation device different from the data generation device 2. FIG. 11 is a diagram showing the configuration of the model evaluation device 3. The model evaluation device 3 is, for example, a computer, and has a communication unit 31, a storage unit 32, and a control unit 33. The control unit 33 has a time-series data acquisition unit 331, an information creation unit 332, and an evaluation result output unit 333.

The communication unit 31 has the same function as the communication unit 21, and has a communication interface for transmitting and receiving data via the network N. The communication unit 31 receives, for example, time-series data corresponding to the frequency data input to the machine learning model M and time-series data output by the machine learning model M from the data generation device 2, and receives the received data in a time-series manner. Input to the data acquisition unit 331. Further, the communication unit 31 transmits the evaluation result input from the evaluation result output unit 333 to the data generation device 2.

The storage unit 32 includes a ROM, a RAM, and a hard disk. The storage unit 32 stores a program executed by the control unit 33. In addition, the storage unit 32 temporarily stores various data received via the communication unit 31.

The control unit 33 is, for example, a CPU, and functions as a time-series data acquisition unit 331, an information creation unit 332, and an evaluation result output unit 333 by executing a program stored in the storage unit 32.

The time-series data acquisition unit 331 acquires the generation time-series data of the above parameters output by the machine learning model M in which the frequency data of the parameters corresponding to the predetermined time-series data is input via the communication unit 31. Further, the time-series data acquisition unit 331 acquires predetermined time-series data input to the machine learning model M that outputs the generated time-series data via the communication unit 31. The time-series data acquisition unit 331 may acquire predetermined time-series data together with the generated time-series data from the data generation device 2, or may acquire the predetermined time-series data separately from the generated time-series data. Further, the time-series data acquisition unit 331 may acquire information indicating the distance traveled by the vehicle T during the period in which the predetermined time-series data is acquired, together with the predetermined time-series data.

The information creation unit 332 generates information indicating a change in the state of a predetermined member of the vehicle T specified based on the time series data acquired by the time series data acquisition unit 331. Specifically, the information creation unit 332 is specified based on the first information corresponding to the change in the state of the predetermined member of the vehicle T during the period in which the predetermined time series data is measured and the generated time series data. A second piece of information corresponding to a change in the state of a predetermined member is created.

When the predetermined time-series data is the time-series data of the speed of the vehicle T, the information creation unit 332 creates the first information which is the fuel consumption of the vehicle T within the period in which the predetermined time-series data is measured. Specifically, the machine learning model M has an acceleration occurrence frequency in the velocity frequency data showing the velocity occurrence frequency distribution in the velocity time series data and the time series data obtained by first-order differentiation of the velocity time series data. When the acceleration frequency data showing the distribution and the acceleration frequency data are created by machine learning as the teacher data, the information creation unit 332 uses the fuel consumption, which has a high degree of correlation with the speed of the vehicle T, as the first information.

The information creation unit 332 obtains the fuel consumption amount calculated based on, for example, the speed in the predetermined time series data, the relationship between the speed and the fuel injection amount stored in the storage unit 32 in advance, and the predetermined time series data. Is divided by the mileage of the acquired period to calculate the fuel consumption corresponding to the first information. Further, the information creation unit 332 calculates the fuel consumption amount based on the speed in the generated time series data generated by the machine learning model M and the relationship between the speed and the fuel injection amount stored in the storage unit 32 in advance. Is divided by the mileage to calculate the fuel consumption corresponding to the second information.

When the vehicle T has a diesel engine, the information creation unit 332 is based on the first information corresponding to the change in the state of the DPF within the period in which the predetermined time series data is measured and the generated time series data. Second information corresponding to the specified change in the state of the DPF may be created.

The evaluation result output unit 333 outputs the result of evaluating the machine learning model M based on the difference between the first information and the second information created by the information creation unit 332. The evaluation result output unit 333 evaluates the machine learning model M higher as the difference is smaller, and lowers the evaluation of the machine learning model M as the difference is larger. The evaluation result output unit 333 transmits the evaluation result to the data generation device 2 via, for example, the communication unit 31. The evaluation result output unit 333 may display the evaluation result on the display or may print it on the printer.

In this way, the model evaluation device 3 evaluates the machine learning model M based on the change in the state of the member having a high degree of correlation with the parameters of the time series data that can be output by the machine learning model M. The administrator or the creator can appropriately grasp the state of the machine learning model M. Further, the model evaluation device 3 transmits the evaluation result to the data generation device 2, so that the data generation device 2 can improve the machine learning model M.

In the above description, the case where the information creation unit 332 creates the first information using the predetermined time series data is illustrated, but the information creation unit 332 is while the predetermined time series data is acquired. The first information actually measured in the vehicle T may be acquired, and the evaluation result output unit 333 may evaluate the machine learning model M using the first information.

[Example]
FIG. 12 is a diagram showing an example in which time series data is created from frequency data using the data generation device 2 according to the present embodiment. FIG. 12A shows time series data of the speed actually measured in the vehicle T. FIG. 12B shows a time series output from the machine learning model M when the speed frequency data and the acceleration frequency data corresponding to the time series data shown in FIG. 12A are input to the machine learning model M. Shows the data. Each data is deformed while maintaining the tendency of the actual data.

Comparing FIGS. 12 (a) and 12 (b), although there are differences in details, the overall tendency of the change in velocity is almost the same. It is considered that the difference between the two becomes smaller as the machine learning model M further learns.

[Effect of this embodiment]
As described above, the data generation device 2 is a machine using learning time-series data of predetermined parameters measured while the vehicle T is traveling and learning frequency data corresponding to the learning time-series data as teacher data. By learning, it is possible to create a machine learning model M capable of outputting time series data by inputting frequency data of a predetermined parameter. By creating such a machine learning model M, the data generation device 2 analyzes the generation time series data output from the machine learning model M even when only the frequency data of a predetermined parameter can be obtained. As a result, the manager of the vehicle T using the data generation device 2 can obtain various information related to the parameters such as the fuel consumption of the vehicle T, the degree of deterioration of parts, and the like.

The data generation device 2 may create a machine learning model M by further using the frequency data based on the time-series data of the values obtained by first-order differentiation of the values of the parameters related to the learning time-series data as the teacher data. When the learning time-series data is the velocity time-series data, the data generation device 2 creates the machine learning model M using the velocity frequency data and the acceleration frequency data. When the data generation device 2 creates the machine learning model M using the plurality of frequency data in this way, the accuracy of the machine learning model M is improved.

Further, the data generation device 2 includes a first learning frequency data showing the occurrence frequency distribution of the first parameter and a second learning frequency data showing the occurrence frequency distribution of the second parameter whose change rate is slower than that of the first parameter. May be used as teacher data to create a machine learning model M. The data generation device 2 may further use the frequency data of the first parameter value and the first derivative value of the second parameter value as teacher data. When the data generation device 2 uses the frequency data related to the plurality of parameters having different tendencies of the change speed in this way, the accuracy of the generated time series data output by the machine learning model M is further improved.

Further, the data generation device 2 divides the time series data related to the parameters measured by the vehicle T to create a plurality of divided time series data, and a plurality of selected time series selected from the created plurality of divided time series data. The data may be rearranged to create time-series data for learning. Further, the data generation device 2 may create learning frequency data showing a parameter occurrence frequency distribution in the created learning time series data. By operating the data generation device 2 in this way, it is possible to increase the teacher data that can be used for machine learning, so that the learning period of the machine learning model M can be shortened and the performance of the machine learning model M can be improved. Can be done.

Further, the data generation device 2 may further have a low frequency passing filter that removes frequency components equal to or higher than the threshold value in the generated time series data output by the machine learning model M. Then, the data generation device 2 determines the characteristics of the filter and the weight of the machine learning model M based on the result of comparing the time series data input to the machine learning model M with the time series data output from the filter. You may update it. When the data generation device 2 has such a configuration, the time series data output by the data generation device 2 can be further improved.

Further, the data generation device 2 includes first information corresponding to a change in the state of a predetermined member of the vehicle during the period in which the predetermined time series data is measured, and the predetermined member specified based on the generated time series data. The result of evaluating the machine learning model based on the difference from the second information corresponding to the change of the state may be output. The data generation device 2 is a machine learning model based on the result of comparing the fuel consumption corresponding to the time series data measured in the vehicle T and the fuel consumption specified based on the time series data output by the machine learning model M, for example. Evaluate M. When the data generation device 2 has such a configuration, the administrator or creator of the data generation device 2 can determine whether or not the machine learning model M is appropriately configured.

Then, the data generation device 2 may update the weight of the machine learning model M based on the result evaluated in this way. The data generation device 2 updates the weights based on the evaluation result, so that the data generation device 2 can create a machine learning model M suitable for the purpose of use.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes can be made within the scope of the gist thereof. is there. For example, all or a part of the device can be functionally or physically distributed / integrated in any unit. Also included in the embodiments of the present invention are new embodiments resulting from any combination of the plurality of embodiments. The effect of the new embodiment produced by the combination also has the effect of the original embodiment.

For example, in the above description, the case where the data generation device 2 acquires the time series data and the frequency data from the data collection device 1 has been illustrated, but the data generation device 2 has the function of the data collection device 1. The data generation device 2 may receive measurement data from a plurality of vehicles T.

Further, in the above description, the computer functioning as the data generation device 2 has the function of the model creation device, and the generation time series output from the machine learning model M in response to the input of the generation frequency data. Although the case where it also has a function of outputting data has been illustrated, the configuration of the data generation device 2 is not limited to this. Even if the data generation device 2 is composed of a first computer that functions as a model creation device, and a second computer that inputs generation frequency data to the first computer and acquires generation time series data from the first computer. Good.

1 Data collection device 2 Data generation device 3 Model evaluation device 21 Communication unit 22 Storage unit 23 Control unit 31 Communication unit 32 Storage unit 33 Control unit 231 Time-series data acquisition unit 232 Learning frequency data acquisition unit 233 Generation frequency data acquisition unit 234 Data output unit 235 Model creation unit 236 Data generation unit 237 Learning time series data creation unit 238 Learning frequency data creation unit 239 Model evaluation unit 331 Time series data acquisition unit 332 Information creation unit 333 Evaluation result output unit

Claims (9)

A time-series data acquisition unit that acquires time-series data of the vehicle speed measured while the vehicle is running as learning time-series data, and a time-series data acquisition unit.
Learning frequency data acquisition unit that acquires learning speed frequency data showing the speed occurrence frequency distribution in the learning time series data and learning acceleration frequency data showing the acceleration occurrence frequency distribution in the learning time series data. When,
By machine learning the learning time-series data, the corresponding learning speed frequency data, and the learning acceleration frequency data as teacher data, the speed frequency data and the acceleration frequency data are input in response to the input. A model creation unit that creates a machine learning model that outputs generated time-series data that is time-series data of the vehicle speed, and
Modeling device with. The model creation unit has the generation time series data output from the machine learning model when the learning speed frequency data and the learning acceleration frequency data are input to the machine learning model, and the learning speed frequency data. And the weight of the machine learning model is updated based on the difference from the learning time series data corresponding to the learning acceleration frequency data.
The model creation device according to claim 1. The learning frequency data acquisition unit further acquires learning gradient data indicating the gradient of the place where the vehicle traveled while the learning time series data was acquired as the teacher data.
The model creation unit includes the generation time series data output from the machine learning model when the learning speed frequency data, the learning acceleration frequency data, and the learning gradient data are input to the machine learning model. The weight of the machine learning model is updated based on the difference between the learning speed frequency data, the learning acceleration frequency data, and the learning time series data corresponding to the learning gradient data.
The model creation device according to claim 2. The model creation unit identifies the weight of the vehicle and creates a plurality of the machine learning models corresponding to the specified weight.
The model creation device according to any one of claims 1 to 3. A generation frequency data acquisition unit that acquires generation speed frequency data and generation acceleration frequency data used to generate the generation time series data, and a generation frequency data acquisition unit.
A data output unit that outputs the generation time series data output from the machine learning model by inputting the generation speed frequency data and the generation acceleration frequency data into the machine learning model.
Have more,
The model creation device according to any one of claims 1 to 4. The learning acceleration frequency data includes a plurality of acceleration frequency data corresponding to each of the plurality of speeds of the vehicle.
The model creation device according to any one of claims 1 to 5. A frequency data acquisition unit that acquires speed frequency data and acceleration frequency data of the vehicle measured while the vehicle is running, and a frequency data acquisition unit.
A machine learning model in which the learning time-series data of the vehicle speed, the corresponding learning speed frequency data, and the learning acceleration frequency data are machine-learned as teacher data, and the speed frequency data of the vehicle and the vehicle A data generation unit that generates generation time-series data, which is time-series data corresponding to the speed frequency data and the vehicle acceleration frequency data, by inputting the acceleration frequency data.
Data generator with. Computer runs,
A step of acquiring time-series data of the speed of the vehicle measured while the vehicle is running as learning time-series data, and
A step of acquiring a learning speed frequency data showing a speed occurrence frequency distribution in the learning time series data and a learning acceleration frequency data showing an acceleration occurrence frequency distribution in the learning time series data.
By machine learning the learning time-series data, the corresponding learning speed frequency data, and the learning acceleration frequency data as teacher data, the speed frequency data and the acceleration frequency data are input in response to the input. A step of creating a machine learning model that outputs generated time-series data, which is time-series data of the vehicle speed, and
How to create a model with. Computer runs,
The step of acquiring the speed frequency data and the acceleration frequency data of the vehicle measured while the vehicle is running, and
A machine learning model in which the learning time-series data of the vehicle speed, the corresponding learning speed frequency data, and the learning acceleration frequency data are machine-learned as teacher data, and the speed frequency data of the vehicle and the vehicle Steps to enter acceleration frequency data and
A step of outputting the generation time series data output from the machine learning model in response to inputting the speed frequency data of the vehicle and the acceleration frequency data of the vehicle into the machine learning model.
Data generation method having.

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