Sampling control device

Abstract

To provide a sampling control device for performing more appropriate sampling than before.SOLUTION: A sampling control device mainly samples a plurality of signals having order of priority with a first predetermined period. When object signals as such signals that a variation absolute value of a signal value is a first threshold or more or a time variation of the signal value is a second threshold or more are generated among the plurality of signals, the device subsamples the highest-priority signal among the object signals with a second predetermined period shorter than the first predetermine period.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a sampling control device, and more particularly to a sampling control device that samples a plurality of signals at a predetermined cycle. [Background technology]

[0002] A conventional sampling control device of this type has been proposed in which, during vehicle diagnosis, long-period vehicle information is sampled at long intervals, and when a trigger signal is turned on by the driver operating a trigger switch, engine speed as short-period vehicle information is sampled at a predetermined short interval (see, for example, Patent Document 1). By sampling the engine speed at short intervals, this device accurately detects the fluctuation characteristics of the engine speed and improves the accuracy of vehicle diagnosis. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 07-190894 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the above-mentioned sampling control device, there are times when it is desirable to sample long-period information at short intervals, but sampling at short intervals based on the driver's operation often results in inappropriate sampling, and more appropriate sampling cannot be performed.

[0005] The sampling control device of the present disclosure has a primary object to perform more appropriate sampling. [Means for solving the problem]

[0006] The sampling control device of the present disclosure employs the following means to achieve the above-mentioned main object.

[0007] The sampling control device of the present disclosure includes: A sampling control device that performs primary sampling of a plurality of signals having priority at a first predetermined period, comprising: When a target signal occurs among the plurality of signals, the absolute value of the amount of change in signal value is equal to or greater than a first threshold value, or the amount of change in signal value over time is equal to or greater than a second threshold value, the signal with the highest priority among the target signals is sub-sampled at a second predetermined period that is shorter than the first predetermined period. It is characterized by:

[0008] The sampling control device disclosed herein performs primary sampling on multiple signals having priority at a first predetermined period. This allows sampling of multiple signals at the first predetermined period. Furthermore, when a target signal among the multiple signals is generated in which the absolute value of the change in signal value is equal to or greater than a first threshold or the change in signal value over time is equal to or greater than a second threshold, sub-sampling is performed on the highest-priority target signal at a second predetermined period shorter than the first predetermined period. This allows target signals exhibiting unusual changes, such as the absolute value of the change in signal value being equal to or greater than the first threshold or the change in signal value over time being equal to or greater than the second threshold, to be sampled at a second predetermined period shorter than the first predetermined period, thereby enabling detailed changes in the target signals to be obtained. Moreover, since the highest-priority target signal is sampled at the second predetermined period, detailed changes in the high-priority signal can be obtained. As a result, more accurate sampling can be performed.

[0009] Here, the second predetermined period may be a period that is an integer division of the first predetermined period. In this way, sampling can be performed at a second predetermined period that is an integer multiple of the first predetermined period. Also, sub-sampling of the highest priority signal among the target signals may continue until the next target signal occurs. [Brief explanation of the drawings]

[0010] [Figure 1]1 is a configuration diagram showing an outline of the configuration of a sampling control device 20 according to an embodiment of the present disclosure. [Figure 2] 10 is a flowchart showing an example of a sub-sampling process executed by a sub-sampling control unit 26. [Figure 3] 10 is an explanatory diagram showing an example of a signal X, its steepness determination, a signal Y, its steepness determination, main sampling, and sub-sampling. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Next, a mode (embodiment) for carrying out the present disclosure will be described. Fig. 1 is a configuration diagram showing an outline of the configuration of a sampling control device 20 according to one embodiment of the present disclosure. The sampling control device 20 of the embodiment is configured as a well-known microcomputer centered around a CPU (not shown), and includes functional blocks of an input circuit 22, a main sampling control unit 24, a sub-sampling control unit 26, and a memory unit 28. The functional blocks of the input circuit 22, main sampling control unit 24, sub-sampling control unit 26, and memory unit 28 are configured using hardware and software.

[0012] The input circuit 22 receives input of signals detected from n first signal sensors 30a to n-th signal sensors 30n that detect n first signals A to n-th signal N. The main sampling control unit samples the signals detected from the n first signal sensors 30a to n-th signal sensors 30n at a first predetermined period and stores the samples in the memory unit 28. The sub-sampling control unit samples one of the signals detected from the n first signal sensors 30a to n-th signal sensors 30n based on a sub-sampling process at a second predetermined period that is shorter than the first predetermined period (for example, ¼, ⅕, ⅛, etc. of the first predetermined period) and stores the sampled signal in the memory unit 28.

[0013] 2 is a flowchart showing an example of the sub-sampling process executed by the sub-sampling control unit 26. This process is executed at every second predetermined period.

[0014] When the sub-sampling process is executed, the sub-sampling control unit first calculates the absolute value of change α and the amount of change over time β of n signals input to the input circuit 22 (step S110), and selects, from among the signals, signals whose absolute value of change α is equal to or greater than a threshold value αref or whose amount of change over time β is equal to or greater than a threshold value βref as signals judged to be steep (target signals) (step S110). The threshold values ​​αref and βref are threshold values ​​used to judge whether a signal change is steep, and can be determined for each signal according to the characteristics of each signal.

[0015] Next, it is determined by steepness determination whether or not a target signal has been selected (step S120). If it is determined that a target signal has been selected, the signal with the highest priority among the target signals is selected as a sampling signal (step S130), the sampling signal is sampled (step S160), and the sampled sampling signal is stored in storage unit 28 (step S170), after which the process ends. Note that the priorities of the n first signals A to n-th signals N must be determined in advance.

[0016] If it is determined in step S120 that no target signal has been selected, it is determined whether or not a sampling signal has been selected (step S140). If a sampling signal has been selected, the sampling signal is sampled (step S160), the sampled sampling signal is stored in storage unit 28 (step S170), and this process ends. In other words, even if no target signal has been selected, the signal last selected as the sampling signal is sampled. On the other hand, if a sampling signal has not been selected, the signal with the highest priority among the n first signals A to n-th signals N is selected as the sampling signal (step S150), the sampling signal is sampled (step S160), and the sampled sampling signal is stored in storage unit 28 (step S170), and this process ends.

[0017] FIG. 3 is an explanatory diagram showing an example of signal X, its steepness determination, signal Y, its steepness determination, main sampling, and sub-sampling. Times T1, T2, T3, and T4 indicate the timing of main sampling. Signal X has a higher priority than signal Y. In the diagram, white circles indicate main sampling, and black circles indicate sub-sampling. At time T1, signals X and Y are main-sampled. Immediately thereafter, the steepness determination for signal X turns ON, and signal X is selected as the sampling signal and sub-sampled. Thereafter, while the steepness determination for signal X continues to be ON, the steepness determination for signal Y may turn ON. However, since signal X has a higher priority than signal Y, signal X is selected as the sampling signal and sub-sampled. Just before time T3, the steepness determination for signal X is turned OFF, but signal X continues to be sub-sampled until the steepness determination for signal Y turns ON after time T3. After time T3, when the steepness determination of signal Y turns ON, the steepness determination of signal X is OFF, so signal Y is selected as the sampling signal and is sub-sampled.

[0018] In the sampling control device 20 according to the embodiment described above, a signal having an absolute value α of the change in signal value equal to or greater than a threshold αref or an amount of change in signal value over time equal to or greater than a threshold βref is selected as a target signal from among the n first signals A through nth signals N, the highest-priority target signal is selected as a sampling signal, and the sampling signal is sub-sampled at a second predetermined period shorter than the first predetermined period. This allows target signals exhibiting unusual changes, such as an absolute value α of the change in signal value equal to or greater than the threshold αref or an amount of change in signal value over time equal to or greater than the threshold βref, to be sampled at a second predetermined period shorter than the first predetermined period, thereby enabling detailed changes in the target signals to be obtained. Moreover, because the highest-priority target signal is sampled at the second predetermined period, unusual changes in the high-priority signal can be obtained in detail. As a result, more appropriate sampling can be performed.

[0019] The correspondence between the main elements of the embodiment and the main elements of the invention described in the "Means for Solving the Problems" section will be explained below. In the embodiment, the sampling control device 20, which includes an input circuit 22, a main sampling control unit 24, a sub-sampling control unit 26, and a memory unit 28, corresponds to the "sampling control device."

[0020] The correspondence between the main elements of the embodiments and the main elements of the invention described in the "Means for Solving the Problem" section does not limit the elements of the invention described in the "Means for Solving the Problem" section, since the embodiments are examples for specifically explaining the mode for implementing the invention described in the "Means for Solving the Problem" section. In other words, the interpretation of the invention described in the "Means for Solving the Problem" section should be based on the description in that section, and the embodiments are merely specific examples of the invention described in the "Means for Solving the Problem" section.

[0021] The present disclosure has been described above using embodiments, but the present disclosure is not limited to these embodiments in any way, and it goes without saying that the present disclosure can be embodied in various forms within the scope that does not deviate from the gist of the present disclosure. [Industrial Applicability]

[0022] The present disclosure is applicable to the sampling control device manufacturing industry and the like. [Explanation of symbols]

[0023] 20 sampling control device, 22 input circuit, 24 main sampling control section, 26 sub-sampling control section, 28 storage section, 30a to 30n first signal sensor to n-th signal sensor.

Claims

[Claim 1] 1. A sampling control device for performing primary sampling of a plurality of signals having priority at a first predetermined period, comprising: When a target signal occurs among the plurality of signals, the absolute value of the amount of change in signal value is equal to or greater than a first threshold value, or the amount of change in signal value over time is equal to or greater than a second threshold value, the signal with the highest priority among the target signals is sub-sampled at a second predetermined period that is shorter than the first predetermined period. A sampling control device characterized by:

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