JP2006170741A - Abnormality detector for motive power measurement system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure/facilitate the protection of an object under test or of a load device and the investigation of the cause of an abnormality by detecting the abnormality at the point when the abnormality begins to occur to acquire measurement information of every kind at the point. <P>SOLUTION: A first abnormality detection means is added to a motive power measuring system for testing the object under test by repetitively executing power operation according to an automatic operation pattern by a stipulated number of times. The detection means is used for performing abnormality determination when a measurement value on the object under test exceeds a preset range during a test. Whether abnormality exists or not is determined based on whether differences between a first operation period T<SB>1</SB>and second and downward operation periods T<SB>2</SB>, ... , T<SB>N</SB>fall within allowable difference set values of an operation pattern in repetitive operation of the automatic operation pattern. In addition, the following are included: abnormality determination on any one of torque and speed of the object under test, current and voltage of the load device, or sound generated from the object under test, or a combination of abnormality determination on a combination of two or more, test stoppage processing based on abnormality determination, and recording of test information at a determination point. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a device for detecting an abnormality when an abnormality occurs during a test such as an automatic durability test of a specimen in a power measurement system (engine bench tester, power train tester, chassis dynamometer) having an automatic driving function. .

  FIG. 3 shows a configuration example of a power measurement system (powertrain tester) having an automatic driving function. This system includes a computer 1 having an automatic operation schedule creation / execution command output function, a controller 2 for controlling a test object and a load device (dynamometer), a load device control panel 3 and a load device (dynamometer) 4. The test body (test object) 5 is configured to enable a test such as an automatic durability test.

  In order to realize this test, the computer 1 of the power measurement system reads an automatic operation schedule created in advance by a tester, and automatically tests the test body 5 and the load device (dynamometer) 4 to automatically perform power operation. have.

  The automatic test processing function has an operation schedule for repeatedly executing a certain operation pattern, and is configured to automatically perform a predetermined number of repeated power operations by setting one operation pattern and the number of repetitions. The operation pattern is described by a set of a set of a command value, a rate of change to the command value, and a transition condition (time, detected value value, etc.) to the next command value. By grouping several clusters of this group and setting the number of repetitions, it is possible to perform an unmanned test for performing automatic power operation repeatedly according to a specific operation pattern on the test body.

  Furthermore, the automatic test processing function has a processing function that measures, records, and detects abnormalities in test information. When the measured value of the specimen exceeds the preset range, it is judged as abnormal and the test is stopped. Processing is automatically performed, and the test information immediately before reaching the abnormal state can be recorded.

  The abnormality determination target includes, for example, a rotational speed abnormality of the test body 5 and the load device 4, an upper / lower limit range abnormality of the test torque, and the abnormality determination includes a detection value and a set value (threshold value) for each determination target item. Are compared and a warning is output (for example, refer to Patent Document 1).

  Such an automatic test processing function is, for example, a processing flow shown in FIG. 4 in an automatic durability test. The tester creates an automatic operation schedule and inputs it to the computer 1 (S1), and starts an automatic durability test by the computer 1. The computer 1 generates and outputs control commands for the specimen 5 and the load device 4 in accordance with the automatic operation schedule, and performs one automatic durability operation (S2). The computer 1 checks whether there is an abnormality during the automatic endurance operation (S3). This abnormality is detected by an abnormality of the facility device, a measurement item arbitrarily set by the tester exceeds the normal range, or the like.

  When there is no abnormality and one automatic endurance operation is completed, the computer 1 checks whether or not the operation has reached a specified number of operations (S4). In this check, if the automatic endurance operation has not reached the specified number of times, the operation returns to the automatic endurance operation again. If the predetermined number of times has been reached, the test is terminated assuming that the automatic endurance test is normal.

When any abnormality occurs during the automatic endurance operation, the computer 1 performs an operation stop process by detecting the abnormality (S5), records and displays operation data before and after the occurrence of the abnormality, and ends the automatic endurance test (S6). .
Japanese Patent Laid-Open No. 9-15100

  As described above, in the current automatic endurance test and the like, the tester performs an abnormality determination for an item that defines a normal range with respect to a certain measurement value of the test specimen, because the value is exceeded.

  For this reason, even if an item is being measured, an abnormality occurs due to an abnormal value of an item that the tester did not expect, or a test that cannot be correlated or measured between multiple items, even though the value is within the tester's specified range. Unable to determine abnormality due to abnormal body condition.

  In addition, if the measured value exceeds the tester's specified range, it is already abnormal, and if the cause is secondary or even if it is a primary factor, multiple abnormalities will occur before stopping When this occurs, it is difficult to observe the generation of the primary factor from the investigation of the specimen that stopped abnormally.

  FIG. 5 shows an example of the occurrence situation of the above problem. The driving pattern shown in (a) of the figure is shown in the case of the vehicle speed, and is accelerated from the zero speed to the speed A in the driving section R1, and in the next driving section R2 that has reached the speed A, the speed A is set for the set time t1 seconds. Drive at a constant speed, decelerate from speed A to speed B in the next operation section R3, operate at a constant speed t2 seconds at speed B in the next operation section R4 that has reached speed B, and in the next operation section R5 Decelerate from speed B to zero speed.

  The automatic durability test by repeating the above operation pattern is repeatedly performed a set number of times. Among the driving patterns in this set number of repetition tests, when the vehicle speed in the driving sections R1 and R2 changes as shown in FIG. 5B, an abnormality starts to occur from the Nth test to the (N + 1) th test. Since the vehicle speed does not exceed the upper limit vehicle speed alone, the next N + 2th operation is entered without any abnormality being detected, and when the vehicle speed exceeds the upper limit vehicle speed at the N + 2th time, an abnormality is detected. Made.

  In such an abnormality detection, various measurement information in the N-th operation where an actual abnormality has started cannot be obtained, so that the test stop is delayed and it is difficult to protect the specimen and the load device. In addition, it becomes difficult to investigate the cause of the abnormality.

  An object of the present invention is to provide a power measurement system that can detect an abnormality when the abnormality starts and obtain various measurement information at that time, and reliably and easily investigate the cause of the abnormality and the protection of the specimen and the load device. An object of the present invention is to provide an abnormality detection device.

  In order to solve the above problem, the present invention determines whether or not the deviation between each operation time of the operation pattern in the repeated operation of the automatic operation pattern and the operation time set or measured in advance is within the allowable deviation setting value. Abnormality detection means for determining the presence or absence of abnormality, and whether or not other measurement target values such as torque of the test specimen are within the allowable deviation set value for abnormality determination based on the operation time of the operation pattern By combining the determinations, it is possible to detect an abnormality when the abnormality cannot be detected by the abnormality determination based on the measurement value range, or when an abnormality appears in the driving in the circumstances leading to the abnormality, and the following configuration is characteristic.

(1) In a power measurement system in which a test body is connected to a load device, a power operation of the test body is performed according to an automatic operation pattern, and a power test of the test body is performed by repeatedly executing the power operation a specified number of times.
An abnormality detection means for determining whether there is an abnormality based on whether or not a deviation between each operation time of the operation pattern in the repeated power operation of the automatic operation pattern and the operation time set or measured in advance is within an allowable deviation setting value. It is characterized by having.

  (2) The abnormality detecting means is set in advance with a measured value or a combination of a plurality of measured values of torque and speed of the test specimen during testing, current and voltage of the load device, and sound generated from the test specimen. Alternatively, it is determined whether or not the deviation from the measured value is within the allowable deviation setting value, and the presence / absence of abnormality is determined by combining this determination result and the determination result of abnormality due to the operation time of the operation pattern. It is characterized by that.

  (3) The abnormality detection means is characterized by comprising means for performing a test stop process upon determination of presence of abnormality and recording test information at the time of determination.

  As described above, according to the present invention, whether or not the deviation between each operation time of the operation pattern in the repeated operation of the automatic operation pattern and the operation time set or measured in advance is within the allowable deviation setting value. Since the abnormality detection means for determining the presence / absence is provided, the following effects are obtained.

  Abnormalities in the specimen before the test specimen or load device becomes abnormal in measurement value when the abnormality can be detected earlier than the conventional abnormality detection function and the operating time becomes abnormal due to some abnormality unexpected by the tester Can be detected. In addition, the protection of the specimen and the load device and the investigation of the cause of the abnormality are ensured and easy.

  In addition, the accuracy of abnormality determination is further improved by combining abnormality determination based on the operation time of the operation pattern with abnormality determination whether or not the value of another measurement target such as the torque of the test specimen is within the allowable deviation setting value. be able to.

  FIG. 1 is a schematic diagram of abnormality determination provided in an abnormality detection device showing an embodiment of the present invention. In this abnormality determination, the abnormality of the specimen is determined based on the operation time of the operation pattern.

  As described above, in a test such as an automatic durability test, a specific operation pattern is repeated for a long time. At this time, since the speed and driving time are defined for each driving section R1 to R5 (see FIG. 5), if the test specimen is normal, the time for digesting the pattern once does not change substantially. It is.

Therefore, in the present embodiment, the time T ₁ from the time when the operation according to the first operation pattern is started to the end of the first pattern operation is measured and stored. After that, measure the required time T _N of the driving pattern for the second and subsequent driving patterns, and compare whether the deviation (± ΔT) between this time T _N and the first required time T ₁ is within the allowable time. Thus, the presence or absence of abnormality of the test apparatus and the test body is determined.

  Note that the “permissible time of deviation (± ΔT)” is set in advance by the tester, and when the driving time according to the second and subsequent driving patterns deviates by more than “allowable time of deviation” from the first required time. As “pattern driving digestion time abnormality”, operation stop processing is performed in the same manner as when the vehicle speed is abnormal.

In FIG. 1, as in FIG. 5, the driving pattern is the vehicle speed, and the first driving time T ₁ is compared with the second and subsequent driving required times T ₂ , T ₃ , T ₄ ,. The presence or absence of is determined. In the figure, the case where an abnormality starts to occur for the Nth time is shown, and the abnormality determination process detects an abnormality during the Nth operation because the deviation between the required operation time T _N and the time T ₁ exceeds an allowable value. At that time, the operation stop output is obtained. As a result, the power measurement system stops the operation after the (N + 1) th time to reliably protect the test specimen and the load device, and by acquiring various measurement information at the time of abnormality detection, the cause of the abnormality can be reliably and easily determined. To.

FIG. 2 shows a detailed processing flow of the abnormality determination processing in FIG. Measuring each time the operating time the start of the test by operation schedule (S11, S12), when the operation of the first time stores the operating time T ₁ of the first in the memory (S13, S14), 2 th The subsequent operation time T _N (T ₂ , T ₃ ,...) Is stored in the memory each time (S15), and a deviation Te between the operation time T ₁ and T _N is obtained (S16). The absolute value of the deviation Te is compared with the allowable error set value Ts (S17). When the absolute value of the deviation Te is smaller than the allowable deviation setting value Ts, the process returns to the next operation time measurement (S11). When the absolute value of the deviation Te exceeds the allowable deviation setting value Ts, an abnormality has started to occur. Determination is made, various measurement data at that time is recorded, and a test stop command is generated (S18).

In the embodiment, the case where the abnormality determination process is performed based on the deviation between the operation times T ₁ and T _{N in} the repeated test based on the operation pattern is shown. However, when the abnormality is determined, another measurement value is used. By performing the same abnormality determination and determining the presence or absence of abnormality by combining the determination result with the abnormality determination based on the operation time, the accuracy of the abnormality determination can be further increased.

  For example, the measurement target is set to the torque and speed in addition to the operation time, and the torque and speed in the same operation section after the first time and the second time are sampled, and whether or not the deviation between both sampling data exceeds a certain value The presence / absence of abnormality can be determined by combining the determination result with the abnormality determination based on the operation time.

  In addition to the operating time, the current and voltage of the load device are taken as the measurement object, and the current and voltage of the load device in the same operation section after the first time and the second time are sampled, and the deviation between the two sampling data is constant. Whether or not there is an abnormality can be determined based on whether or not the value is exceeded. Furthermore, the measurement object is the sound generated from the test specimen in addition to the operation time, and the sound pressure in the same operation section after the first time and the second time is sampled, and the deviation between the two sampling data exceeds a certain value The presence or absence of an abnormality can be determined based on the result. Furthermore, the presence / absence of abnormality can be determined by combining the abnormality determination result obtained by combining a plurality of measurement elements such as current and torque of the load device with the abnormality determination result based on the operation time.

  Further, in the embodiment, the case where abnormality is determined from the deviation from the operation time after the first operation time using the first operation time as a comparison reference is shown. However, the operation time used as the comparison reference is based on past tests and preliminary tests. The obtained value can be obtained as a preset or measured value. Similarly, for other measurement objects (torque and speed of the test piece, current and voltage of the load device, and sound generated from the test piece), values obtained by past tests or preliminary tests are set or measured in advance. Can be used as a reference for comparison.

The schematic diagram of the abnormality determination which shows embodiment of this invention. The detailed flow of the abnormality determination in embodiment. A configuration example of a power measurement system. Processing flow of conventional automatic durability (repetition) test. An example of a problem occurrence situation due to conventional abnormality determination.

Explanation of symbols

1 Computer 2 Controller 3 Control Panel 4 Load Device (Dynamometer)
5 Specimen (test object)

Claims (3)

In a power measurement system that connects a test body to a load device, performs power operation of the test body according to an automatic operation pattern, and repeatedly performs this power operation a specified number of times to perform a power test of the test body,
An abnormality detection means for determining whether there is an abnormality based on whether or not a deviation between each operation time of the operation pattern in the repeated power operation of the automatic operation pattern and an operation time set or measured in advance is within an allowable deviation setting value. An abnormality detection device for a power measurement system, comprising:   The abnormality detection means is set or measured in advance with a measured value or a combination of a plurality of measured values of torque or speed of the test specimen, current or voltage of the load device, or sound generated from the test specimen during the test. It is determined whether the deviation from the measured value is within the allowable deviation setting value, and the presence / absence of abnormality is determined by combining this determination result and the determination result of presence / absence of abnormality due to the operation time of the operation pattern. The abnormality detection device for a power measurement system according to claim 1. 3. The abnormality detection of the power measurement system according to claim 1, wherein the abnormality detection means includes means for performing a test stop process when a determination is made that there is an abnormality and recording test information at the time of the determination. apparatus.

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