JP2010078573A - Garbage vehicle weighing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a garbage vehicle weighing device capable of detecting easily an abnormality of various modes in a weight sensor by utilizing actively vibration of an engine of a garbage vehicle. <P>SOLUTION: The garbage vehicle weighing device 101 of the garbage vehicle 100 includes weight sensors R1-R4 and a controller 40 with a weighing display part. The device 101 is constituted so that the controller 40 with the weighing display part detects an abnormality of the weight sensors R1-R4 based on comparison between vibration information of the engine provided on the garbage vehicle 100 extracted based on analog data outputted from the weight sensors R1-R4, and prescribed reference information. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dust truck weighing scale that measures the weight of dust provided in a garbage truck, and in particular, it is possible to easily detect abnormalities in various modes in a weight sensor by utilizing vibration of an engine provided in the garbage truck. It relates to a garbage truck weighing scale.

  2. Description of the Related Art Conventionally, a garbage collection vehicle (hereinafter simply referred to as “garbage truck”) has been used as an environmental maintenance vehicle for collecting garbage taken to a garbage collection place from homes and companies.

  The garbage truck includes a garbage truck weighing scale for measuring the weight of the garbage. The garbage truck weigher included in this garbage truck is configured to be able to measure the weight of the dust taken out from households and businesses to a garbage collection point. For example, a garbage truck stores dust taken out from a household, a company, or the like to a garbage collection place inside the garbage collection housing. Then, the total weight of the dust and the dust collecting housing is measured by a load cell for measuring the weight of the dust disposed below the dust collecting housing of the garbage truck. Here, the weight display part of the garbage truck weigher displays the weight obtained by subtracting the weight of the dust collection housing from the total weight of the dust collection housing and the dust. That is, in the garbage truck, only the weight of the collected dust is displayed on the weight display unit. As a result, the driver of the garbage truck can recognize the weight of the dust stored in the garbage collection housing.

  Specifically, the garbage truck usually has load cells developed exclusively for in-vehicle use at the four corners below the garbage collection housing. The four load cells are disposed on the chassis of the garbage truck, and support the garbage collection housing of the garbage truck from below. When the four load cells store dust inside the dust collecting housing, they output an electrical signal proportional to the total weight of the stored dust and the dust collecting housing. Then, in the controller with the weighing display unit of the garbage truck weigher, the output electric signals (analog data) are combined into one system of electric signals and then converted into digital data by the AD converter. At this time, in the garbage truck weigher, the weight of the dust collecting casing weighed in advance is subtracted from the total weight of the dust collecting casing and the dust. In the weight display section provided in the controller with the weighing display section of the garbage truck weigher, the net weight of the dust is obtained by subtracting the weight of the dust collection casing from the total weight of the dust collection casing and the dust. Is displayed. In addition, the driver of the garbage truck recognizes the weight of the dust stored in the dust collecting casing, and prints a receipt on which the weight of the dust is recorded, if necessary.

  By the way, in the conventional garbage truck weight scale, the load cell provided in the garbage truck weight scale changes over time due to the periodic vibration of the garbage truck engine, the temperature change, etc., so the reliability of the load cell (for example, the electrical connection in the load cell) There was a problem that reliability, etc.) could not be sufficiently secured over a long period of time.

  Therefore, in order to accurately grasp the total weight of the dust stored in the dust collection housing, the driver of the conventional garbage truck can check whether there are any abnormalities in the four load cells before collecting the dust. We were doing special work to detect.

  For example, a driver of a conventional garbage truck prepares a weighing object such as a pseudo dust separately from the garbage car weight meter before collecting the dust, and collects the weighing object such as the dummy dust. Based on a change in the weight of the weighing object when it is moved from an arbitrary position within the housing to another position, the presence or absence of abnormality in the four load cells is detected (see, for example, Patent Document 1).

Alternatively, prior to collecting the dust, the driver of the conventional garbage truck prepares a weighing object such as a pseudo dust separately from the garbage truck weighing scale, and collects the weighing object such as the pseudo garbage. Based on whether or not the difference between the weight of the weighing object weighed at this time and the reference weight of the weighing object stored in advance is greater than or equal to a predetermined reference value The presence or absence of abnormality in the four load cells is detected (see, for example, Patent Document 2).
JP 2006-162252 A JP 2003-035592 A

  However, the first conventional configuration requires a separate weighing object such as a pseudo dust for detecting the presence or absence of abnormality in the load cell. Moreover, in this 1st structure, when the driver | operator of a garbage truck differs, the arbitrary positions and another position at the time of moving a weighing thing may differ in the inside of a garbage collection housing. This becomes a factor of deteriorating detection accuracy when detecting the presence or absence of abnormality in the load cell.

  Also in the second configuration of the related art, a weighing object such as a pseudo dust for detecting the presence or absence of abnormality in the load cell is separately required. Also, in this second configuration, since the presence or absence of abnormality in the load cell is detected simply based on the weight difference of the weighing object, it is difficult to appear in the fluctuation of the electric signal output from the load cell. It is difficult to detect it accurately.

  The present invention has been made to solve the above-described conventional problems, and it is possible to easily detect abnormalities in various modes in the weight sensor by actively utilizing the vibration of the engine of the garbage truck. It aims to provide a garbage truck weighing scale.

  In order to solve the above-described conventional problems, a garbage truck weighing scale according to the present invention includes a weight sensor that outputs analog data corresponding to the weight of the dust, and a weight of the dust based on the analog data output by the weight sensor. A garbage truck weigher for a garbage truck, wherein the garbage truck weight meter is an engine vibration information provided in the garbage truck extracted based on the analog data output from the weight sensor. The weight sensor is configured to detect an abnormality of the weight sensor on the basis of a comparison with the predetermined reference information.

  With such a configuration, since the vibration information of the garbage truck engine extracted based on the analog data output from the weight sensor includes various information including information on the presence or absence of an abnormality in the initial stage of the weight sensor, this information is included. By appropriately using the information, it is possible to provide a garbage truck weighing scale that can easily detect abnormalities in various modes in the weight sensor with a relatively simple configuration.

  In this case, a plurality of the weight sensors are provided, and the garbage truck weigh scale includes vibration amplitude information of the engine included in the garbage truck extracted based on the analog data output from the plurality of weight sensors, and predetermined reference vibration amplitude information. Based on the comparison of each of the plurality of weight sensors, an abnormality of the weight sensor is detected.

  With such a configuration, for each of the plurality of weight sensors, each of the plurality of weight sensors is based on a relatively simple configuration of comparing engine vibration amplitude information extracted based on analog data output from the weight sensor and predetermined reference vibration amplitude information. Since the presence or absence of abnormality in the weight sensor is detected, it is possible to easily and reliably detect abnormality in various modes in the weight sensor of the garbage truck weigh scale.

  In the above case, a plurality of the weight sensors are provided, and the garbage truck weigh scale includes vibration spectrum information of the engine provided in the garbage truck extracted based on the analog data output from the plurality of weight sensors and a predetermined reference vibration. An abnormality of the weight sensor is detected based on a comparison with spectrum information for each of the plurality of weight sensors.

  With such a configuration, even if an abnormality that is difficult to detect in the configuration in which the vibration amplitude information of the engine is compared with the predetermined reference vibration amplitude information in the weight sensor, the analog data output by the weight sensor is output. Based on another configuration that compares engine vibration spectrum information extracted based on predetermined reference vibration spectrum information, the presence or absence of abnormality in multiple weight sensors is detected. It is possible to easily and reliably detect the abnormality.

  Further, in the above case, the plurality of weight sensors are provided, and the garbage truck weighing scale is configured to have the plurality of weights of the vibration amplitude information of the engine provided in the garbage truck extracted based on the analog data output from the plurality of weight sensors. Based on a comparison between vibration amplitude difference information between sensors and predetermined reference vibration amplitude difference information, an abnormality of the weight sensor is detected.

  With this configuration, for each of the plurality of weight sensors, the vibration amplitude difference information between the plurality of weight sensors and the predetermined reference vibration amplitude difference information of the engine vibration amplitude information extracted based on the analog data output from the weight sensor. Since the comparison is made, it is possible to detect in detail whether there is an abnormality in the weight sensor. This makes it possible to easily and more reliably detect abnormalities in various modes in the weight sensor of the garbage truck weigh scale.

  Further, in the above case, the plurality of weight sensors are provided, and the garbage truck weight scale is the plurality of weights of the vibration phase information of the engine provided in the garbage truck extracted based on the analog data output from the plurality of weight sensors. Based on a comparison between vibration phase difference information between sensors and predetermined reference vibration phase difference information, an abnormality of the weight sensor is detected.

  In such a configuration, in the weight sensor, an abnormality that is difficult to detect in the configuration in which the vibration amplitude difference information between the plurality of weight sensors of the engine vibration amplitude information is compared with the predetermined reference vibration amplitude difference information has occurred. Even if there is, based on another configuration of comparing the vibration phase difference information between the plurality of weight sensors of the vibration phase information of the engine extracted based on the analog data output from the weight sensor and the predetermined reference vibration phase difference information, Since the presence or absence of abnormality in the plurality of weight sensors is detected in detail, it is possible to easily and more reliably detect abnormality in various modes in the weight sensor of the garbage truck weighing scale.

  In the above case, the filter further includes a filter that selectively passes only a specific frequency component in the analog data output from the weight sensor, and the filter includes a specific vibration frequency component of an engine included in the garbage truck. Only the analog data is selectively passed.

  With such a configuration, the filter selectively passes only specific analog data including vibration frequency components at the time of idling of the engine included in the garbage truck, so that it is possible to remove an adverse effect caused by unnecessary frequency components in the analog data. It becomes possible.

  In this case, the filter includes at least one of a high cut filter, a low pass filter, and a band pass filter.

  With such a configuration, all of the high-cut filter, low-pass filter, and band-pass filter can be easily configured and are available, so that adverse effects caused by unnecessary frequency components in analog data can be easily and inexpensively made. It can be removed.

  According to the garbage truck weighing scale according to the present invention, there is provided a garbage truck weighing scale capable of easily detecting abnormalities in various modes in the weight sensor by actively utilizing the vibration of the garbage truck engine. The effect that it becomes possible can be acquired.

  In the present invention, the presence or absence of an abnormality in the load cell is reliably detected by appropriately using the vibration information of the engine extracted based on the analog data output from the load cell (weight sensor) of the garbage truck weight meter. . Here, in the present invention, vibration information such as engine vibration amplitude information, engine vibration spectrum information, and engine vibration phase information is used as engine vibration information. This makes it possible to provide a garbage truck weighing scale that can easily detect abnormalities in various modes in the load cell.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, the best mode for carrying out the invention will be described in detail with reference to the drawings.

(Embodiment 1)
First, the configuration of the garbage truck 100 and the garbage truck weight scale 101 according to the present invention will be described.

  FIG. 1 is a configuration diagram schematically showing the configuration of a garbage truck according to the present invention and a garbage truck weigh scale provided therein, and FIG. 1 (a) is a side view showing the appearance of the garbage truck. 1 (b) is a configuration diagram showing the appearance of a garbage truck weigh scale.

  As shown in FIG. 1 (a), the garbage truck 100 according to the present embodiment includes a cab 10, a chassis 20, and a garbage collection housing 30.

  The cab 10 of the garbage truck 100 shifts and transmits to the wheels a passenger compartment where a driver is seated, an engine (not shown) as a power source of the garbage truck 100, and the rotational driving force of the rotation shaft of the engine. And other components such as transmission means. The chassis 20 has a frame as a main body of the chassis 20, power transmission means for transmitting the rotational driving force of the rotating shaft of the engine to the wheels in the frame, and a fuel storage for storing engine driving fuel. And other components such as means. Then, the driver seated in the passenger compartment appropriately controls the operation of the garbage truck 100 by directly or indirectly operating the components of the garbage truck 100 such as an engine. In addition, the dust collection housing 30 of the garbage truck 100 stores the dust discharged from a home, a company, or the like.

  Further, as shown in FIG. 1A, the chassis 20 and the dust collecting housing 30 of the garbage truck 100 are not shown in the first and second load cells R1, R2 (and FIG. 4 load cells R3 and R4). Specifically, the garbage truck 100 includes first to fourth load cells R1 to R4 for dust weight measurement developed exclusively for in-vehicle use at the four corners below the dust collecting casing 30. The four first to fourth load cells R <b> 1 to R <b> 4 are connected to the chassis 20 of the garbage truck 100. Thereby, the 1st-4th load cells R1-R4 of the garbage truck 100 are supporting the garbage collection housing 30 from the downward direction.

  On the other hand, as shown in FIG.1 (b), the garbage truck weight scale 101 which concerns on this Embodiment is 1st load cell R1, 2nd load cell R2, 3rd load cell R3, 4th load cell R4, wiring C1-C4 and the controller 40 with a measurement display part are comprised.

  The first to fourth load cells R1 to R4 are, for example, load sensors that combine an elastic deformable body and a strain gauge whose amount of deformation is known in advance when a load is applied, and strain due to deformation of the elastic deformable body. By measuring the change in electrical resistance of the gauge, the weight of the dust can be measured. The first to fourth load cells R <b> 1 to R <b> 4 according to the present embodiment have their maximum measurable weights set in accordance with the maximum amount of dust stored in the dust collecting housing 30. And the output terminal (not shown) of 1st-4th load cell R1-R4 and the input terminal (not shown) of the controller 40 with a measurement display part are electrically connected by wiring C1-C4.

  The controller 40 with the weighing display unit includes a weight display unit 40i that displays the weight of collected dust and an input unit 40j that performs an input operation for appropriately controlling the operation of the garbage truck weight meter 101. . In the present embodiment, when a predetermined input operation is performed via the input unit 40j and the weight of the dust is measured by the first to fourth load cells R1 to R4, the weight of the dust is displayed on the weight display unit 40i. Is done. In addition, the controller 40 with the weighing display unit provides an alarm output unit 40n for notifying the number of the load cell in which an abnormality has occurred when an abnormality has occurred in at least one of the first to fourth load cells R1 to R4. It has. In this embodiment, the alarm output unit 40n is configured by four LEDs corresponding to the first to fourth load cells R1 to R4.

  1 (a) and FIG. 1 (b), the basic configuration of the external appearance of the garbage truck 100 and the garbage truck weighing scale 101 is the basic appearance of the conventional garbage truck and the garbage truck weighing scale. The configuration is the same.

  Next, the internal configuration of the garbage truck weigh scale 101 according to the present invention will be described.

  FIG. 2 is a block diagram schematically showing the internal configuration of the garbage truck weigh scale according to the present invention, and FIG. 2 (a) is a block diagram showing the internal configuration of the controller with a weighing display unit. b) is a block diagram showing an internal configuration of each signal adjustment unit provided in the controller with the weighing display unit.

  As shown to Fig.2 (a), the controller 40 with a measurement display part which concerns on this Embodiment is the 1st-4th signal adjustment parts 40a-40d, the multiplexer 40e, AD conversion part 40f, and a moving average calculation part. 40g, a weight calculation unit 40h, a weight display unit 40i, and an input unit 40j. Further, as shown in FIG. 2 (a), the controller 40 with a measurement display unit includes an abnormality detection signal extraction unit 40k, a comparison unit 40l, a reference data storage unit 40m, and an alarm output unit 40n. ing.

  Hereinafter, if it explains in order about the component of controller 40 with a measurement display part, the 1st-4th signal adjustment parts 40a-40d will respectively output the output signal of the 1st-4th load cells R1-R4 to AD conversion part 40f. Adjust to the appropriate output signal for.

  The first signal adjustment unit 40a will be described in detail with reference to FIG. 2B. The first signal adjustment unit 40a includes a high cut filter 401, a signal amplification unit 402, a band pass filter 403, and a low pass. A filter 404, a gain adjustment unit 405, and an addition unit 406 are provided.

  The high cut filter 401 outputs an output signal having a frequency of about 50 Hz or less in the output signal of the first load cell R1 in order to remove harmful harmonic signals and noise signals included in the output signal of the first load cell R1 before AD conversion. Pass and block output signals at frequencies higher than about 50 Hz in the output signal. In other words, the output signal of the first load cell R1 includes harmonics that are normally harmful to the measurement of dust, in addition to the output signal having a frequency of about 50 Hz or less, which is the fundamental frequency when the engine of the garbage truck 100 is idling. Many signals and noise signals are included. Here, in the present embodiment, an output signal having a frequency of about 10 to 50 Hz, which is a fundamental frequency during idling of the engine provided in the garbage truck 100, detects the presence or absence of abnormality in the first to fourth load cells R1 to R4. On the other hand, a harmonic signal, a noise signal, and the like cause a deterioration in detection accuracy of the presence or absence of abnormality in the first to fourth load cells R1 to R4. Therefore, in the present embodiment, a high-cut filter 401 for passing an output signal having a frequency of about 50 Hz or less in the output signal of the first load cell R1 before AD conversion and blocking an output signal having a frequency higher than that is provided. By disposing, harmful harmonic signals and noise signals are removed from the output signal of the first load cell R1.

  The signal amplifying unit 402 has a weak output signal from the first load cell R1 and compensates for the attenuation of the output signal from the first load cell R1 by the high cut filter 401, so that the high cut filter 401 has a frequency higher than about 50 Hz. The output signal of the first load cell R1 from which the output signal has been removed is amplified to a predetermined signal strength required by the controller 40 with the weighing display unit. For example, the signal amplifying unit 402 includes a current amplifier that amplifies the current of the output signal of the first load cell R1, and the current amplifier amplifies the current of the output signal of the first load cell R1 to a predetermined signal intensity.

  Further, the band pass filter 403 selects only an output signal in a predetermined frequency range in the output signal of the first load cell R1 amplified by the signal amplification unit 402 in order to appropriately detect the presence or absence of abnormality in the first load cell R1. Let it pass. As described above, the band-pass filter 403 selectively passes only the output signal in the predetermined frequency range in the output signal of the first load cell R1 for the following reason. That is, the input signal of the first signal adjustment unit 40a provided in the controller 40 with the weighing display unit is based on the total weight of the dust collecting housing 30 and the dust shown in FIG. 1A and the idling rotation of the engine provided in the garbage truck 100. Since the periodic vibration amplitude is combined with the input signal, in order to properly detect the presence or absence of abnormality in the first load cell R1, only an input signal in a predetermined frequency range is selectively selected from the input signal. The input signal that has been passed and selectively passed needs to be an abnormality detection signal for detecting the presence or absence of an abnormality in the first load cell R1. Further, the frequency of the periodic vibration signal at the time of idling of the engine provided in the garbage truck 100 has an optimum value as an abnormality detection signal. Therefore, in this embodiment, after the output signal of the first load cell R1 is appropriately amplified by the signal amplification unit 402, only the output signal in a predetermined frequency range is selectively extracted from the output signal by the bandpass filter 403. Thereby, a suitable abnormality detection signal for appropriately detecting the presence or absence of abnormality in the first load cell R1 is obtained.

  The low-pass filter 404 extracts only the DC signal component of 1 Hz or less, which is the output signal of the weight of the dust, from the output signal of the first load cell R1 amplified by the signal amplification unit 402. Therefore, in the output signal of the first load cell R1 Only output signals of 1 Hz or less are selectively passed. At this time, the low-pass filter 404 passes the output signal of the first load cell R1, which is a DC signal component of 1 Hz or less, without substantially attenuating it, and provides this to the adder 406 described later.

  The gain adjusting unit 405 also sets the output signal of the first load cell R1 that has passed through the bandpass filter 403 to an amplitude that is optimal for AD conversion, for example, the output signal of the first load cell R1. The gain is adjusted so that the amplitude of 1 corresponds to 2 to 5 bits of the bit resolution of AD conversion. The gain adjusting unit 405 may be configured to manually adjust the amplitude of the output signal of the first load cell R1 manually, or automatically based on the digital data after AD conversion. The amplitude of the output signal may be adjusted appropriately.

  The adding unit 406 adds both the output signal from the gain adjusting unit 405 and the output signal of the first load cell R1 that has passed through the low-pass filter 404. Then, the adder 406 provides the added output signals from the gain adjuster 405 and the low-pass filter 404 to the multiplexer 40e described later as an AD conversion output signal.

  In the present embodiment, the internal configuration of the second to fourth signal adjustment units 40b to 40d and the internal configuration of the first signal adjustment unit 40a described above are completely the same.

  On the other hand, as shown to Fig.2 (a), the controller 40 with a measurement display part which concerns on this Embodiment is provided with the multiplexer 40e. The multiplexer 40e is configured by, for example, a predetermined analog switch, selects one output signal from the output signals of the first to fourth signal adjustment units 40a to 40d, and selectively selects the output signal to an AD conversion unit 40f described later. Output. Specifically, the multiplexer 40e receives the output signals of the first to fourth signal adjustment units 40a to 40d in order to receive the output signals of the first to fourth signal adjustment units 40a to 40d by the single AD conversion unit 40f. The data is automatically switched sequentially by division and provided to the AD conversion unit 40f. Alternatively, the multiplexer 40e mixes the output signals of the first to fourth signal adjustment units 40a to 40d so as to be one output signal, and provides this to the AD conversion unit 40f. In the present embodiment, the multiplexer 40e may be omitted when the configuration of the garbage truck weigh scale 101 is simplified.

  The AD converter 40f converts the analog data output from the multiplexer 40e into corresponding digital data. At this time, the AD conversion unit 40f samples the analog data output from the multiplexer 40e at a predetermined sampling frequency set in advance. The AD converter 40f converts the sampled analog data into corresponding digital data.

  The moving average calculator 40g smoothes (averages) the time-series digital data output from the AD converter 40f. For example, the moving average calculation unit 40g calculates a simple moving average value of n time-series digital data output from the AD conversion unit 40f. At this time, the moving average calculation unit 40g smoothes the time-series digital data in a predetermined smoothing period set in advance. The moving average calculation unit 40g is not limited to the simple moving average value of the time series digital data output from the AD conversion unit 40f, and may calculate the weighted moving average value, exponential smoothing moving average value, and the like.

  Further, the weight calculation unit 40h calculates the weight of the dust stored in the dust collection housing 30 provided in the garbage truck 100 based on the output signal of the moving average calculation unit 40g. At this time, in the weight calculation unit 40h, the weight of the dust collection housing 30 weighed in advance is subtracted from the total weight of the dust collection housing 30 and the dust. As a result, the garbage truck weighing scale 101 calculates the net weight of the dust stored in the dust collecting housing 30 obtained by subtracting the weight of the dust collecting housing 30 from the total weight of the dust collecting housing 30 and the dust. Is done.

  Further, the weight display unit 40i displays the weight of the dust housed in the dust collection housing 30 included in the garbage truck 100 as a numerical value based on the output signal of the weight calculation unit 40h. Here, in the present embodiment, the weight of the dust may be volatilely displayed numerically by a predetermined display device as shown in FIG. 1 (b), or not shown in FIG. 1 (b). However, it may be displayed in a non-volatile manner by a numerical value by a predetermined printing device.

  Moreover, as shown to Fig.2 (a), the controller 40 with a measurement display part which concerns on this Embodiment is provided with the input part 40j. In the present embodiment, the input unit 40j is composed of a plurality of touch switches as shown in FIG. With this input unit 40j, the driver of the garbage truck 100 executes a predetermined input operation related to the operation of the garbage truck weight scale 101.

  On the other hand, as shown to Fig.2 (a), the controller 40 with a measurement display part which concerns on this Embodiment is provided with the signal extraction part 40k for abnormality detection. The abnormality detection signal extraction unit 40k selectively extracts an abnormality detection signal for detecting the presence or absence of abnormality in the first to fourth load cells R1 to R4 from the digital data output from the AD conversion unit 40f. Then, the abnormality detection signal extraction unit 40k provides the selectively extracted abnormality detection signal to the comparison unit 40l and the reference data storage unit 40m, respectively. Here, in the present invention, the abnormality detection signal is extracted in order to obtain vibration information such as engine vibration amplitude information, engine vibration spectrum information, engine vibration phase information, and the like included in the garbage truck 100. In the present embodiment, the abnormality detection signal extracted by the abnormality detection signal extraction unit 40k is freed from harmonic signals, noise signals, and the like by the high cut filter 401 provided in the first to fourth signal adjustment units 40a to 40d. In addition, only a specific frequency component is selected by the band-pass filter 403, which is an appropriate abnormality detection signal for obtaining vibration information of the engine included in the garbage truck 100.

  Further, in the present embodiment, the comparison unit 401 compares the vibration amplitude information of the abnormality detection signal provided from the abnormality detection signal extraction unit 40k with predetermined reference vibration amplitude information. At this time, the comparison unit 40l individually compares the vibration amplitude information of the abnormality detection signal with predetermined reference vibration amplitude information for each of the first to fourth load cells R1 to R4. Then, the comparison unit 401 recognizes that an abnormality has occurred in at least one of the first to fourth load cells R1 to R4 based on the comparison between the vibration amplitude information of the abnormality detection signal and the predetermined reference vibration amplitude information. When detected, an alarm signal for notifying at least any abnormality of the first to fourth load cells R1 to R4 is generated, and the generated alarm signal is provided to the alarm output unit 40h. For example, when the comparison unit 40l detects that an abnormality has occurred in the first load cell R1 based on the comparison between the vibration amplitude information of the abnormality detection signal and predetermined reference vibration amplitude information, An alarm signal for notifying the abnormality is generated, and the generated alarm signal is provided to the alarm output unit 40h.

  The reference data storage unit 40m stores in advance predetermined reference vibration amplitude information used in the comparison unit 40l. The predetermined reference vibration amplitude information is obtained, for example, by causing the engine of the garbage truck 100 to perform an idling operation in the same manner as when collecting dust when the first to fourth load cells R1 to R4 are in a normal state. By using the abnormality detection signal provided from the abnormality detection signal extraction unit 40k during driving, each of the first to fourth load cells R1 to R4 is appropriately stored. The predetermined reference vibration amplitude information for each of the first to fourth load cells R1 to R4 is stored in the reference data storage unit 40m at the time of manufacturing the garbage truck weight meter 101, for example. The predetermined reference vibration amplitude information for each of the first to fourth load cells R1 to R4 is obtained when the load cell is replaced in order to reliably detect the occurrence of an abnormality in the first to fourth load cells R1 to R4. Will be reset.

  Further, when an alarm signal for notifying the occurrence of an abnormality in at least one of the first to fourth load cells R1 to R4 is output from the comparison unit 401, the alarm output unit 40n outputs the first to fourth load cells R1 to R4. An alarm indicating that an abnormality has occurred in at least one of the above is output. Here, for example, when it is detected that an abnormality has occurred in the first load cell R1, the alarm output unit 40n indicates to the driver of the garbage truck 100 that the abnormality has occurred in the first load cell. Further, as shown in FIG. 1B, the LED corresponding to the first load cell R1 of the alarm output unit 40n is turned on or blinked. Thereby, the driver of the garbage truck 100 recognizes that an abnormality has occurred in the first load cell R1 by visually recognizing the alarm output of the alarm output unit 40n. Instead of the form in which the occurrence of abnormality in the first load cell R1 or the like is indicated by a light emitting element such as an LED, the alarm output unit 40n notifies the occurrence of abnormality in the first load cell R1 or the like by an alarm display or sound. May be.

  Next, the operation of the garbage truck weigh scale 101 according to the present embodiment will be described.

  As shown in FIGS. 1 (a) and 1 (b), a garbage truck weight meter 101 according to the present embodiment is configured to measure four dust weights disposed between a chassis 20 and a dust collecting housing 30. The first to fourth load cells R1 to R4 for use and the controller 40 with a weighing display unit for measuring and displaying the weight of the dust using the output signals of the first to fourth load cells R1 to R4 for measuring the weight of the dust. I have.

  The output signals of the first to fourth load cells R1 to R4 when the garbage truck 100 is stopped and the engine is idling are combined with the weight of the dust collecting casing 30 and the periodic vibration caused by the engine idling operation. Output signal.

  FIG. 3 is a graph schematically showing the time-dependent displacement of periodic vibration and the time-dependent change of output signals of the first to fourth load cells due to the idling operation of the engine provided in the garbage truck. a) shows the change over time of the output signals of the first to fourth load cells when the garbage truck engine is stopped, and FIG. 3 (b) shows the periodic vibration over time due to the idling operation of the garbage truck engine. FIG. 3C shows changes over time in the output signals of the first to fourth load cells when the garbage truck engine is idling.

  As shown as a straight line a in FIG. 3 (a), when the engine of the garbage truck 100 is stopped, the output signals of the first to fourth load cells R1 to R4 are stable over time at the load cell output Ps. Transition to. In this case, the frequency fp of the output signals of the first to fourth load cells R1 to R4 is frequency fp = 0 because the engine of the garbage truck 100 is stopped.

  On the other hand, as shown by the curve b in FIG. 3B, when the engine of the garbage truck 100 is idling, the engine of the garbage truck 100 is, for example, the displacement center Ds, the maximum displacement Dh, and the minimum displacement Dl. Oscillate periodically so that the displacement amount ΔD and the vibration period Td. In this case, the frequency fd of the periodic vibration caused by the idling operation of the engine of the garbage truck 100 is expressed as fd = 1 / Td as the reciprocal of the vibration period Td.

  Therefore, as shown as a curve c in FIG. 3C, when the garbage truck 100 is stopped, the output signals of the first to fourth load cells R1 to R4 during the idling operation of the engine are the weight of the dust collecting casing 30, The output signal is a composite of periodic vibrations caused by engine idling. More specifically, as shown as a curve c in FIG. 3C, when the engine of the garbage truck 100 is idling, the output signals of the first to fourth load cells R1 to R4 are, for example, output It changes periodically so that it becomes the center Ps, the maximum output Ph, the minimum output Pl, the output displacement amount ΔP, and the vibration period Tp. In this case, if the inertial resistance or the like of the dust collecting housing 30 is ignored, the frequency fp of the periodic change caused by the idling operation of the engine of the output signals of the first to fourth load cells R1 to R4 is fp as the reciprocal of the vibration period Tp. = 1 / Tp. Here, the vibration period Td is equal to the vibration period Tp, and the frequency fd is equal to the frequency fp.

  Therefore, in the present embodiment, the output signal of the frequency fp of the first to fourth load cells R1 to R4, in which the weight of the dust collecting housing 30 and the periodic vibration due to the idling operation of the engine are combined, is used as the first output signal. -4 Used as an abnormality detection signal for detecting the occurrence of an abnormality in the load cells R1 to R4.

  FIG. 4 is a schematic diagram for explaining a mode for detecting occurrence of an abnormality in the load cell based on a comparison between engine vibration amplitude information provided in the garbage truck and predetermined reference vibration amplitude information. 4 shows the change with time of the output signal of the normal load cell, FIG. 4B shows the change with time of the output signal of the load cell in which an abnormality has occurred, and FIG. 4C shows when the occurrence of the abnormality in the load cell is detected. The flowchart of is shown. For the sake of convenience, FIG. 4 illustrates a case where the occurrence of an abnormality in one load cell is detected based on a comparison between engine vibration amplitude information provided in the garbage truck and predetermined reference vibration amplitude information.

  As shown as a curve a in FIG. 4A, when the engine included in the garbage truck 100 is performing idling operation, for example, a normal first load cell R1 before the dust is stored in the dust collecting casing 30. Since the engine of the garbage truck 100 periodically vibrates, the output signal is influenced by the periodic vibration of the engine, and in FIG. 4A, between the load cell output 1.5 and the load cell output 4.5. It changes periodically. In this case, as shown in FIG. 4A, the normal output signal of the first load cell R1 periodically changes so that the amplitude thereof becomes A1 (here, A1 = 1.5).

  On the other hand, as shown by a curve b in FIG. 4B, when the engine included in the garbage truck 100 is performing idling operation, for example, an abnormality occurs before the dust is stored in the dust collecting housing 30. The output signal of the first load cell R1 is affected by the periodic vibration of the garbage truck 100 because the engine of the garbage truck 100 vibrates periodically. In FIG. Changes periodically between outputs 4.0. In this case, as shown in FIG. 4B, the output signal of the first load cell R1 in which an abnormality has occurred has an amplitude of A2 (A2 = 1.0), and the output of the normal first load cell R1 It changes periodically so that the amplitude difference from the amplitude A1 of the signal becomes ΔA (here, ΔA = 0.5).

  On the other hand, in the present embodiment, the vibration amplitude information of the engine included in the garbage truck 100 extracted from the digital data corresponding to the analog data output from the first to fourth load cells R1 to R4 is collected by the garbage truck weight meter 100. Based on the comparison with the predetermined reference vibration amplitude information for each of the first to fourth load cells R1 to R4, the occurrence of an abnormality in the first to fourth load cells R1 to R4 is detected.

  And in this Embodiment, as shown in FIG.4 (c), before starting storage of the dust in the inside of the dust collection housing 30 with which the garbage truck 100 is equipped, the abnormality detection with which the controller 40 with a measurement display part is equipped is detected. When the signal extraction unit 40k automatically fetches the abnormality detection signal from the digital data output by the AD conversion unit 40f (step S1), the comparison unit 40l of the controller 40 with the weighing display unit is provided in the garbage truck 100. The engine vibration amplitude information is compared with predetermined reference vibration amplitude information for each of the first to fourth load cells R1 to R4 (step S2). Specifically, the comparison unit 401 of the controller 40 with the weighing display unit compares the amplitude A1 of the curve a shown in FIG. 4A with the amplitude A2 of the curve b shown in FIG. Executed for every 1 to 4 load cells R1 to R4. Then, the comparison unit 40l of the controller 40 with the weighing display unit, for example, for the first load cell R1 based on the comparison result in step S2, the amplitude A1 of the curve a shown in FIG. When the amplitude difference with the amplitude A2 of the curve b shown is less than the predetermined amplitude difference, it is determined that no abnormality has occurred in the first load cell R1 (step S3a). However, the comparison unit 40l of the controller 40 with the weighing display unit, for example, for the first load cell R1 based on the comparison result in step S2, shows the amplitude A1 of the curve a shown in FIG. When the amplitude difference with the amplitude A2 of the curve b shown is equal to or larger than the predetermined amplitude difference, it is determined that some abnormality has occurred in the first load cell R1 (step S3b). Thereby, LED corresponding to 1st load cell R1 is lighted etc. in alarm output part 40n with which controller 40 with a measurement display part is provided. Note that when the LED corresponding to the first load cell R1 in the alarm output unit 40n is turned on, the driver of the garbage truck 100 grasps the occurrence of the abnormality in the first load cell R1, and the first occurrence of the abnormality occurs. Exchange operation of one load cell R1 is executed.

  Such an operation for detecting the presence or absence of an abnormality in the first to fourth load cells R1 to R4 of the garbage truck weigh scale 101 is performed at the start or end of daily dust collection work. This is appropriately implemented by a driver of the garbage truck 100 or the like in a state where no dust is stored inside.

  As described above, in the present embodiment, when the garbage truck 100 is stopped, the output signals of the first to fourth load cells R1 to R4 when the engine is idling include the periodic signal due to the rotation of the engine in addition to the weight signal from the garbage. Since the signal is included, the periodic vibration signal is positively used as an abnormality detection signal for detecting an abnormality in the first to fourth load cells R1 to R4. Thereby, it is possible to provide the garbage truck weight scale 101 that can easily detect abnormalities in various modes in the first to fourth load cells R1 to R4.

  Further, according to the present embodiment, the vibration information of the engine provided in the garbage truck 100 automatically extracted from the digital data corresponding to the analog data output from the first to fourth load cells R1 to R4 by the garbage truck weighing scale 100. On the basis of a comparison between the first and fourth load cells R1 to R4, and the occurrence of an abnormality in the first to fourth load cells R1 to R4. There is no need to do special work to detect. Thereby, the working efficiency of the driver of the garbage truck 100 is improved.

  In addition, according to the present embodiment, since it is based on the information on the difference in vibration amplitude of the engine provided in the garbage truck 100, the first to fourth load cells R1 to R4 can be used even when the dust is stored in the dust collecting housing 30. It is possible to detect the occurrence of an abnormality. Thereby, the driver of the garbage truck 100 can inspect the garbage truck weight scale 101 at any time as necessary.

  In the embodiment of the present invention, the controller 40 with the weighing display unit of the garbage truck weight meter 101 includes the first to fourth signal adjustment units 40a to 40d, the multiplexer 40e, the AD conversion unit 40f, the moving average calculation unit 40g, the weight. The calculation unit 40h, the weight display unit 40i, the input unit 40j, the abnormality detection signal extraction unit 40k, the comparison unit 40l, the reference data storage unit 40m, and the alarm output unit 40n, and the first to fourth signal adjustment units 40a. Each of ˜40d exemplifies a configuration including a high cut filter 401, a signal amplification unit 402, a band pass filter 403 and a low pass filter 404, a gain adjustment unit 405, and an addition unit 406, but is limited to such a configuration. There is no. In other words, when carrying out the present invention, the controller 40 with the weighing display unit of the garbage truck weight scale 101 has a configuration that can suitably use the vibration signal of the engine of the garbage truck 100 as an abnormality detection signal. Just do it. With this configuration, it is possible to obtain the same effect as in the present embodiment.

  In the present embodiment, analog data output from the first to fourth load cells R1 to R4 is converted into corresponding digital data by the AD converter 40f, and the first to fourth load cells R1 to R4 are converted based on the digital data. Although the form which detects the presence or absence of abnormality was illustrated, it is not limited to such a form. For example, using the analog data output from the first to fourth load cells R1 to R4 (multiplexer 40e), the vibration amplitude information of the engine included in the garbage truck 100 extracted from the analog data and the predetermined reference vibration amplitude information It is good also as a structure which detects the presence or absence of abnormality in 1st-4th load cell R1-R4 based on comparison. Even with such a configuration, it is possible to obtain the same effect as that obtained by the present embodiment.

(Embodiment 2)
The hardware configuration of the garbage truck weight meter according to the second embodiment of the present invention is the same as the hardware configuration of the garbage truck weight meter 101 described in the first embodiment. Therefore, in the present embodiment, the description of the external configuration of the garbage truck weight meter and the internal configuration of the garbage truck weight meter is omitted.

  Hereinafter, the operation of the garbage truck weigh scale 101 according to the present embodiment will be described. In the following description, for the sake of convenience, components similar to those in the first embodiment according to the present embodiment are denoted by the same reference numerals as those in the first embodiment.

  FIG. 5 is a schematic diagram for explaining a mode of detecting the occurrence of an abnormality in the load cell based on a comparison between engine vibration spectrum information provided in the garbage truck and predetermined reference vibration spectrum information. Shows the vibration spectrum of the output signal of the normal load cell, FIG. 5 (b) shows the vibration spectrum of the output signal of the load cell in which an abnormality has occurred, and FIG. 5 (c) shows when the occurrence of the abnormality in the load cell is detected. The flowchart of is shown. For the sake of convenience, FIG. 5 illustrates a case where the occurrence of an abnormality in one load cell is detected based on a comparison between engine vibration spectrum information provided in the garbage truck and predetermined reference vibration spectrum information.

  As shown as a curve a in FIG. 5A, for example, the frequency spectrum of the normal output signal of the first load cell R1 is about 12 (Hz) in FIG. ) To a frequency spectrum of about 28 (Hz). In this case, as shown in FIG. 5A, for example, the frequency spectrum of the normal output signal of the first load cell R1 has a frequency of about 12 (Hz) so that the peak frequency F1 is F1 = 20 (Hz). ) To a frequency of about 28 (Hz).

  On the other hand, as shown by a curve b in FIG. 5B, for example, the frequency spectrum of the output signal of the first load cell R1 in which an abnormality has occurred is caused by the periodic vibration of the engine provided in the garbage truck 100, as shown in FIG. In (b), the frequency spectrum is distributed between a frequency of about 22 (Hz) and a frequency of about 38 (Hz). In this case, as shown in FIG. 5B, for example, the frequency spectrum of the output signal of the first load cell R1 in which an abnormality has occurred has a peak frequency F2 of F2 = 30 (Hz) and a normal first Between the frequency of about 22 (Hz) and the frequency of about 38 (Hz) so that the frequency difference with the peak frequency F1 of the frequency spectrum of the output signal of one load cell R1 is ΔF (here, ΔF = 10 (Hz)). Distributed in.

  On the other hand, in this embodiment, the garbage spectrum weigher 100 has the vibration spectrum information of the engine included in the garbage truck 100 extracted from the digital data corresponding to the analog data output by the first to fourth load cells R1 to R4. Based on the comparison with predetermined reference vibration spectrum information for each of the first to fourth load cells R1 to R4, the occurrence of an abnormality in the first to fourth load cells R1 to R4 is detected.

  And in this Embodiment, as shown in FIG.5 (c), before starting storage of the dust in the inside of the dust collection housing 30 with which the garbage truck 100 is equipped, the abnormality detection with which the controller 40 with a measurement display part is equipped is detected. When the signal extraction unit 40k automatically fetches the abnormality detection signal from the digital data output by the AD conversion unit 40f (step S1), the comparison unit 40l of the controller 40 with the weighing display unit is provided in the garbage truck 100. The engine vibration spectrum information is compared with the predetermined reference vibration spectrum information for each of the first to fourth load cells R1 to R4 (step S2).

  Specifically, the comparison unit 401 of the controller 40 with the weighing display unit compares the peak frequency F1 of the curve a shown in FIG. 5A with the peak frequency F2 of the curve b shown in FIG. This is executed for each of the first to fourth load cells R1 to R4. Then, the comparison unit 401 of the controller 40 with the weighing display unit, for example, for the first load cell R1 based on the comparison result in step S2, the peak frequency F1 of the curve a shown in FIG. When the frequency difference from the peak frequency F2 of the curve b shown in FIG. 4 is less than the predetermined frequency difference, it is determined that no abnormality has occurred in the first load cell R1 (step S3a). However, the comparison unit 40l of the controller 40 with the weighing display unit, for example, for the first load cell R1 based on the comparison result in step S2, and the peak frequency F1 of the curve a shown in FIG. When the frequency difference from the peak frequency F2 of the curve b shown in FIG. 4 is equal to or greater than a predetermined frequency difference, it is determined that some abnormality has occurred in the first load cell R1 (step S3b). Accordingly, as in the case of the first embodiment, the LED corresponding to the first load cell R1 is turned on in the alarm output unit 40n provided in the controller 40 with the weighing display unit. Further, when the LED corresponding to the first load cell R1 in the alarm output unit 40n is turned on, the driver of the garbage truck 100 grasps the occurrence of the abnormality in the first load cell R1, and the first occurrence of the abnormality occurs. Exchange operation of one load cell R1 is executed.

  As described above, according to the present embodiment, an abnormality that occurs in at least one of the first to fourth load cells R1 to R4 included in the garbage truck weight meter 101 is difficult to appear in the vibration amplitude information of those output signals. Since the abnormality is detected by another configuration based on the comparison between the vibration spectrum information of the engine included in the garbage truck 100 and the predetermined reference vibration spectrum information, abnormalities in various modes in the first to fourth load cells R1 to R4 are detected. It is possible to provide the garbage truck weight scale 101 that can easily detect the above.

  Other points are the same as those in the first embodiment.

(Embodiment 3)
The hardware configuration of the garbage truck weight meter according to the third embodiment of the present invention is the same as the hardware configuration of the garbage truck weight scale 101 described in the first embodiment. Therefore, also in this embodiment, the description of the external configuration of the garbage truck weigh scale and the internal configuration of the garbage truck scale is omitted.

  FIG. 6 is a diagram for explaining a mode of detecting occurrence of an abnormality in a load cell based on a comparison between vibration amplitude difference information between a plurality of load cells and predetermined reference vibration amplitude difference information of engine vibration amplitude information of a garbage truck. 6A is a schematic diagram, FIG. 6A shows a vibration amplitude difference of output signals between normal load cells, FIG. 6B shows a vibration amplitude difference of output signals between load cells in which an abnormality occurs, FIG. 6C shows a flowchart for detecting occurrence of an abnormality in the load cell.

  FIG. 8 is a correspondence diagram for specifying a load cell in which an abnormality has occurred based on a difference in vibration information among a plurality of load cells.

  6A, for example, the output signal of the normal first load cell R1 is influenced by the periodic vibration of the engine of the garbage truck 100, and the load cell output in FIG. It periodically changes between 1.5 and load cell output 4.5. In this case, as shown in FIG. 6A, the normal output signal of the first load cell R1 periodically changes so that the amplitude thereof is A1 (here, A1 = 1.5). Similarly, as shown as a curve b in FIG. 6A, for example, the output signal of the normal second load cell R2 is affected by the periodic vibration of the engine of the garbage truck 100, and FIG. In (a), the load cell output is periodically changed from 2.0 to 4.0. In this case, as shown in FIG. 6A, the output signal of the normal second load cell R2 changes periodically so that the amplitude thereof becomes A2 (here, A2 = 1.0). In such a case, as shown in FIG. 6A, the vibration amplitude difference ΔA between the vibration amplitude information of the first load cell R1 and the vibration amplitude information of the second load cell R2 is ΔA = A1−A2 = 0.5.

  On the other hand, as shown by a curve b ′ in FIG. 6B, for example, the output signal of the second load cell R2 in which some abnormality has occurred is changed from the load cell output 2.5 to the load cell output 3.. Periodically changes between 5. In this case, as shown in FIG. 6 (b), the output signal of the second load cell R2 in which this abnormality has occurred has a period such that its amplitude is A3 (here, A3 = 0.5). Changes. In such a case, as shown in FIG. 6B, the vibration amplitude difference ΔB between the vibration amplitude information of the first load cell R1 and the vibration amplitude information of the second load cell R2 is ΔB = A1− A3 = 1.0.

  In contrast, in the present embodiment, the garbage amplitude meter 100 includes the vibration amplitude information of the engine included in the garbage truck 100 extracted from the digital data corresponding to the analog data output from the first to fourth load cells R1 to R4. Based on a comparison between vibration amplitude difference information between a plurality of load cells and predetermined reference vibration amplitude difference information, the occurrence of an abnormality in the first to fourth load cells R1 to R4 is detected.

  In the present embodiment, as shown in FIG. 6C, in the same manner as in the first and second embodiments, the abnormality detection signal extraction unit 40k of the controller 40 with the weighing display unit performs the AD conversion. An abnormality detection signal is automatically captured from the digital data output by the unit 40f (step S1). Then, the comparison unit 401 of the controller 40 with the weighing display unit, for example, vibration amplitude difference information between the first load cell R1 and the second load cell R2 of the vibration amplitude information of the engine included in the garbage truck 100, and a predetermined reference Comparison with vibration amplitude difference information is executed (step S2).

  Specifically, the comparison unit 401 of the controller 40 with the weighing display unit compares the vibration amplitude difference ΔA shown in FIG. 6A with the vibration amplitude difference ΔB shown in FIG. Between R1 and the second load cell R2, between the second load cell R2 and the third load cell R3, between the third load cell R3 and the fourth load cell R4, between the fourth load cell R4 and the first load cell R1 Run for each. Then, the comparison unit 40l of the controller 40 with the weighing display unit, for example, for the first and second load cells R1 and R2, based on the comparison result in step S2, the vibration amplitude difference ΔA shown in FIG. If the amplitude difference between the vibration amplitude difference ΔB shown in b) is less than the predetermined amplitude difference, it is determined that no abnormality has occurred in the first and second load cells R1, 2 (step S3a). . However, based on the result of the comparison in step S2, the comparison unit 40l of the controller 40 with the weighing display unit calculates the vibration amplitude difference ΔA shown in FIG. 6 (a) and the vibration amplitude difference ΔB shown in FIG. 6 (b). If the amplitude difference is greater than or equal to the predetermined amplitude difference, it is determined that an abnormality has occurred in either the first or second load cell R1, 2 (step S3b).

  Referring to FIG. 8, in the present embodiment, the amplitude difference between ΔA and ΔB related to the first and second load cells R1 and R2 is equal to or greater than a predetermined amplitude difference, and the first and fourth load cells R1, 4 is equal to or greater than a predetermined amplitude difference, the comparison unit 40l of the controller 40 with the weighing display unit determines that an abnormality has occurred in the first load cell R1. Further, as shown in FIG. 8, the amplitude difference between ΔA and ΔB related to the first and second load cells R1 and R2 is not less than a predetermined amplitude difference, and ΔA and ΔB related to the second and third load cells R2 and R3 are Is equal to or greater than the predetermined amplitude difference, the comparison unit 40l of the controller 40 with the weighing display unit determines that an abnormality has occurred in the second load cell R2. Further, as shown in FIG. 8, the amplitude difference between ΔA and ΔB related to the second and third load cells R2 and R3 is not less than a predetermined amplitude difference, and ΔA and ΔB related to the third and fourth load cells R3 and R4 are Is equal to or greater than a predetermined amplitude difference, the comparison unit 40l of the controller 40 with the weighing display unit determines that an abnormality has occurred in the third load cell R3. Further, as shown in FIG. 8, the amplitude difference between ΔA and ΔB according to the third and fourth load cells R3, 4 is not less than a predetermined amplitude difference, and ΔA and ΔB according to the first and fourth load cells R1, 4 Is equal to or greater than a predetermined amplitude difference, the comparison unit 40l of the controller 40 with the weighing display unit determines that an abnormality has occurred in the fourth load cell R4.

  When it is determined that an abnormality has occurred in the first load cell R1, the LED corresponding to the first load cell R1 is turned on or the like in the alarm output unit 40n included in the controller 40 with the weighing display unit. Thereby, the driver of the garbage truck 100 grasps the occurrence of the abnormality in the first load cell R1, and executes the replacement work of the first load cell R1 in which the abnormality has occurred.

  Here, in the present embodiment, as the predetermined reference vibration amplitude difference information, four sets of abnormality detection signals detected by the four load cells of the first to fourth load cells R1 to R4 at the time of manufacturing the garbage truck weighing scale 101. The initial amplitude difference between the load cells is stored in advance as reference information for each set.

  Other points are the same as those in the first and second embodiments.

(Embodiment 4)
The hardware configuration of the garbage truck weight meter according to the fourth embodiment of the present invention is the same as the hardware configuration of the garbage truck weight meter 101 described in the first embodiment. Therefore, also in this embodiment, the description of the external configuration of the garbage truck weigh scale and the internal configuration of the garbage truck scale is omitted.

  FIG. 7 is a diagram for explaining an embodiment in which occurrence of abnormality in the load cell is detected based on comparison between vibration phase difference information between a plurality of weight sensors of vibration phase information of an engine included in the garbage truck and predetermined reference vibration phase difference information. 7A shows a vibration phase difference of output signals between normal load cells, and FIG. 7B shows a vibration phase difference of output signals between load cells in which an abnormality has occurred. FIG. 6C shows a flowchart for detecting occurrence of an abnormality in the load cell.

  7A, for example, the normal output signal of the first load cell R1 is influenced by the periodic vibration of the engine of the garbage truck 100, and in FIG. It periodically changes between 1.5 and load cell output 4.5. 7A, for example, the normal output signal of the second load cell R2 is affected by the periodic vibration of the engine of the garbage truck 100, and in FIG. It changes periodically between the load cell output 2.0 and the load cell output 4.0. In such a case, as shown in FIG. 7A, the vibration phase difference between the vibration phase information of the first load cell R1 and the vibration phase information of the second load cell R2 is ΔP1, and here the curve a Since the phase and the phase of the curve b are equal, ΔP1 = 0.

  On the other hand, as shown by a curve b ′ in FIG. 7B, for example, the output signal of the second load cell R2 in which some abnormality has occurred is shown in FIG. While periodically changing between 0, the phase is delayed with respect to the phase of the curve a. Therefore, in such a case, as shown in FIG. 7B, the vibration phase difference between the vibration phase information of the first load cell R1 and the vibration phase information of the second load cell R2 is ΔP2 (here, ΔP2 ≠ 0).

  On the other hand, in this embodiment, the garbage truck weighing scale 100 has the vibration phase information of the engine included in the garbage truck 100 extracted from the digital data corresponding to the analog data output from the first to fourth load cells R1 to R4. Based on a comparison between vibration phase difference information between a plurality of load cells and predetermined reference vibration phase difference information, the occurrence of an abnormality in the first to fourth load cells R1 to R4 is detected.

  In this embodiment, as shown in FIG. 7 (c), the abnormality detection signal extraction unit 40k of the controller 40 with the weighing display unit performs AD conversion as in the case of the first to third embodiments. An abnormality detection signal is automatically captured from the digital data output by the unit 40f (step S1). Then, the comparison unit 401 of the controller 40 with the weighing display unit, for example, vibration phase difference information between the first load cell R1 and the second load cell R2 of the vibration phase information of the engine included in the garbage truck 100, and a predetermined reference Comparison with vibration phase difference information is executed (step S2).

  Specifically, the comparison unit 40l of the controller 40 with the weighing display unit compares the vibration phase difference ΔP1 shown in FIG. 7A with the vibration phase difference ΔP2 shown in FIG. Between R1 and the second load cell R2, between the second load cell R2 and the third load cell R3, between the third load cell R3 and the fourth load cell R4, between the fourth load cell R4 and the first load cell R1 Run for each. Then, the comparison unit 40l of the controller 40 with the weighing display unit, for example, for the first and second load cells R1 and 2, based on the comparison result in step S2, the vibration phase difference ΔP1 shown in FIG. ) Is less than the predetermined phase difference, it is determined that no abnormality has occurred in the first and second load cells R1, 2 (step S3a). However, the comparison unit 40l of the controller 40 with the weighing display unit has a phase difference between the vibration phase difference ΔP1 shown in FIG. 7A and the vibration phase difference ΔP2 shown in FIG. If there is, it is determined that an abnormality has occurred in either the first or second load cell R1, 2 (step S3b).

  As in the case of the third embodiment, when it is determined that an abnormality has occurred in the first load cell R1, the alarm output unit 40n provided in the controller 40 with the weighing display unit includes the first load cell R1. The corresponding LED is turned on. Thereby, the driver of the garbage truck 100 grasps the occurrence of the abnormality in the first load cell R1, and executes the replacement work of the first load cell R1 in which the abnormality has occurred.

  Here, in the present embodiment, as the predetermined reference vibration phase difference information, four sets of abnormality detection signals detected by the four load cells of the first to fourth load cells R1 to R4 at the time of manufacturing the garbage truck weight meter 101. The initial phase difference between the load cells is stored in advance as reference information for each set.

  Other points are the same as in the first, second, and third embodiments.

  A garbage truck weighing scale according to the present invention is an industrial garbage truck weighing scale that can easily detect abnormalities in various modes in a weight sensor by actively utilizing vibrations of a garbage truck engine. Fully available.

FIG. 1 is a configuration diagram schematically showing the configuration of a garbage truck according to the present invention and a garbage truck weigh scale provided therein, and FIG. 1 (a) is a side view showing the appearance of the garbage truck. 1 (b) is a configuration diagram showing the appearance of a garbage truck weigh scale. FIG. 2 is a block diagram schematically showing the internal configuration of the garbage truck weigh scale according to the present invention, and FIG. 2 (a) is a block diagram showing the internal configuration of the controller with a weighing display unit. b) is a block diagram showing an internal configuration of each signal adjustment unit provided in the controller with the weighing display unit. FIG. 3 is a graph schematically showing the time-dependent displacement of periodic vibration and the time-dependent change of output signals of the first to fourth load cells due to the idling operation of the engine provided in the garbage truck. a) shows the change over time of the output signals of the first to fourth load cells when the garbage truck engine is stopped, and FIG. 3 (b) shows the periodic vibration over time due to the idling operation of the garbage truck engine. FIG. 3C shows changes over time in the output signals of the first to fourth load cells when the garbage truck engine is idling. FIG. 4 is a schematic diagram for explaining a mode of detecting the occurrence of an abnormality in the load cell based on a comparison between engine vibration amplitude information provided in the garbage truck and predetermined reference vibration amplitude information. 4 shows the change with time of the output signal of the normal load cell, FIG. 4B shows the change with time of the output signal of the load cell in which an abnormality has occurred, and FIG. 4C shows when the occurrence of the abnormality in the load cell is detected. The flowchart of is shown. FIG. 5 is a schematic diagram for explaining a mode of detecting the occurrence of an abnormality in the load cell based on a comparison between engine vibration spectrum information provided in the garbage truck and predetermined reference vibration spectrum information. Shows the vibration spectrum of the output signal of the normal load cell, FIG. 5 (b) shows the vibration spectrum of the output signal of the load cell in which an abnormality has occurred, and FIG. 5 (c) shows when the occurrence of the abnormality in the load cell is detected. The flowchart of is shown. FIG. 6 is a diagram for explaining a mode of detecting the occurrence of an abnormality in the load cell based on a comparison between vibration amplitude difference information between a plurality of weight sensors of vibration amplitude information of an engine provided in the garbage truck and predetermined reference vibration amplitude difference information. FIG. 6A shows the vibration amplitude difference of the output signal between normal load cells, and FIG. 6B shows the vibration amplitude difference of the output signal between load cells in which an abnormality has occurred. FIG. 6C shows a flowchart for detecting occurrence of an abnormality in the load cell. FIG. 7 is a diagram for explaining an embodiment in which occurrence of abnormality in the load cell is detected based on comparison between vibration phase difference information between a plurality of weight sensors of vibration phase information of an engine included in the garbage truck and predetermined reference vibration phase difference information. 7A shows a vibration phase difference of output signals between normal load cells, and FIG. 7B shows a vibration phase difference of output signals between load cells in which an abnormality has occurred. FIG. 6C shows a flowchart for detecting occurrence of an abnormality in the load cell. FIG. 8 is a correspondence diagram for specifying a load cell in which an abnormality has occurred based on a difference in vibration information among a plurality of load cells.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cab 20 Chassis 30 Dust collection housing 40 Controller with measurement display part 40a 1st signal adjustment part 40b 2nd signal adjustment part 40c 3rd signal adjustment part 40d 4th signal adjustment part 40e Multiplexer 40f AD conversion part 40g Moving average calculation part 40h Weight calculation section 40i Weight display section 40j Input section 40k Abnormal detection signal extraction section 40l Comparison section 40m Reference data storage section 40n Alarm output section 401 High cut filter 402 Signal amplification section 403 Band pass filter 404 Low pass filter 405 Gain adjustment section 406 Addition section 100 garbage truck 101 garbage truck weigh scale C1-C4 wiring R1-R4 1st-4th load cell

Claims (7)

A weight sensor that outputs analog data according to the weight of the dust,
A weight calculator for calculating the weight of the dust based on the analog data output by the weight sensor;
A garbage truck weigh scale for a garbage truck comprising:
The garbage truck weight meter detects an abnormality of the weight sensor based on a comparison between vibration information of an engine included in the garbage truck extracted based on the analog data output from the weight sensor and predetermined reference information. Constructed, garbage truck weight scale. A plurality of weight sensors;
The garbage truck weight scale is configured to compare the vibration amplitude information of the engine included in the garbage truck extracted based on the analog data output from the plurality of weight sensors and predetermined reference vibration amplitude information for each of the plurality of weight sensors. The garbage truck weight scale according to claim 1, wherein the garbage truck weight scale is configured to detect an abnormality of the weight sensor. A plurality of weight sensors;
The garbage truck weight scale is used for comparing the vibration spectrum information of the engine included in the garbage truck extracted based on the analog data output from the plurality of weight sensors and predetermined reference vibration spectrum information for each of the plurality of weight sensors. The garbage truck weight scale according to claim 1, wherein the garbage truck weight scale is configured to detect an abnormality of the weight sensor. A plurality of weight sensors;
The garbage truck weigh scale includes vibration amplitude difference information between the plurality of weight sensors and predetermined reference vibration amplitude of the vibration amplitude information of the engine included in the garbage truck extracted based on the analog data output from the plurality of weight sensors. The garbage truck weight scale according to claim 1, configured to detect an abnormality of the weight sensor based on a comparison with difference information. A plurality of weight sensors;
The garbage truck weigh scale includes information on a vibration phase difference between the plurality of weight sensors and a predetermined reference vibration position of vibration phase information of an engine included in the garbage truck extracted based on the analog data output from the plurality of weight sensors. The garbage truck weight scale according to claim 1, configured to detect an abnormality of the weight sensor based on comparison with phase difference information. A filter that selectively passes only a specific frequency component in the analog data output by the weight sensor;
2. The garbage truck weight scale according to claim 1, wherein the filter selectively allows only the specific analog data including a vibration frequency component of an engine included in the garbage truck to pass.   The garbage truck weight scale according to claim 6, comprising at least one of a high cut filter, a low pass filter, and a band pass filter as the filter.

Images