JP4925587B2 - Vehicle weight measuring device - Google Patents

Description

  The present invention relates to a vehicle weight measuring device that measures the weight of a vehicle while traveling on a weighing platform.

  Conventionally, as a vehicle weight measuring device for measuring the weight of a vehicle such as a truck, the wheel in the running direction of the weighing platform is slightly longer than the dimension of the grounding portion of the wheel, so that the wheel is completely on the weighing platform. Make sure that there is a boarded state (a state where some of the wheels do not touch the ground around the weighing platform), and the type that only measures the weight of one wheel or axle, or all the wheels of the vehicle can be boarded at the same time In addition to the weight of each wheel (or axle) using a weighing platform made to the dimensions, a type that measures the total weight of the vehicle at one timing (for example, a truck scale) is practically used. (For example, refer to Patent Document 1).

  Various methods for measuring the weight of a vehicle in a running state have been proposed in order to efficiently measure the weight of a large number of vehicles.

  As a method for measuring the weight of a vehicle in a running state by a vehicle weight measuring device having a weighing platform whose dimension in the traveling direction of the weighing platform is slightly longer than the dimension of the grounding portion of the wheel, for example, a wheel Is a method in which the time domain where the wheel is in a position where measurement is possible, i.e., the time domain where the grounding part of the wheel is on the measurement table, is detected, and the measured value is obtained based on the weight signal obtained in this time domain. (For example, refer to Patent Document 2).

  On the other hand, as a method for measuring the weight of a vehicle in a running state by using a vehicle weight measuring device having a weighing platform that is manufactured to a size that allows all the wheels of the vehicle to enter simultaneously, the vehicle can be weighed on the weighing platform. A method of obtaining a measured value from a weight signal obtained by detecting that the vehicle is in a position (see, for example, Patent Document 3), performing stability determination on the weight signal of an axle that has entered the weighing platform, and is stable. A method for obtaining a measurement value based on a weight signal obtained in the time domain determined as (for example, see Patent Document 1), a method for determining a time region in which a weight signal can be measured and obtaining a measurement value correctly (for example, Patent Document 1) 4).

  Furthermore, by installing a transmitter in the vehicle and installing receivers at the beginning and end of the weighing platform, the time for the vehicle to move from the beginning to the termination of the weighing platform is determined, and the movement time is a predetermined time. If it is shorter, there is also a proposal for a method for obtaining an accurate measurement value by issuing a signal for prompting re-weighing (see, for example, Patent Document 5).

JP-A-63-81220 Japanese Patent Publication No.53-23099 JP 53-34557 A JP-A-1-282430 JP-A-6-50801

  By the way, even if any of the vehicle weight measuring devices described above is used, the vibration component of the vehicle itself and the vibration component due to the impact of the vehicle on the weighing platform are included, and there is a response delay characteristic due to the load sensor and the measurement circuit. For this reason, these are reflected as errors in the measurement results. Therefore, in order to accurately measure the weight of a vehicle in a running state, in order to reduce the vibration amplitude, the moving speed of the vehicle is slowed, and the grounding part of the wheel is completely on the weighing platform. It needs to last as long as possible.

  However, in actual measurement, the moving speed of the vehicle on the weighing platform may be too fast, or the axle (or wheel) distance of the vehicle may be too short. Even if the weight signal while staying in the section that can be weighed on the table is converted to an average value, it is possible to obtain less than one period of the vibration noise signal, so that the vibration noise signal cannot be removed or vibration noise There is a problem that a large error occurs in the weight measurement result due to the large and irregular amplitude. Furthermore, since the weight signal of the succeeding wheel will rise in a state where the weight signal of the transient and large amplitude generated by the entry of the preceding wheel has not yet converged, an accurate measurement value of the weight of the succeeding wheel cannot be obtained. There is a problem.

  As a countermeasure against these problems, a method of detecting the passing speed of the vehicle on the weighing platform and issuing an alarm when the detected speed deviates from a speed range suitable for obtaining the measured value. It is done. However, even if this method is adopted, vehicles that deviate from the speed range suitable for weight measurement must be reweighed, and the vehicle must be returned to the weighing platform for reweighing. Time is required, which leads to a delay in vehicle weight measurement.

  In addition, in the conventional apparatus, what is the current correct vehicle speed, what is a suitable speed for accurately measuring the weight on the weighing platform, whether the current vehicle speed is within a suitable range for weight measurement, etc. Because it is impossible to provide the driver with objective information on the vehicle, it is necessary to leave the vehicle deceleration / acceleration to the driver's own experience and intuition. There is a problem that it is inappropriate.

  On the other hand, if the vehicle speed on the weighing platform is too slow, it is possible to accurately measure the weight, but this leads to a delay in the weight measurement. This is contrary to the design concept of the device. Further, the conventional apparatus does not have an effective means for guiding a vehicle traveling at a low speed to an appropriate speed, so that there is a problem that the measurement time is prolonged depending on the driver.

  The present invention has been made to solve such problems, and in order to maintain the accuracy and speed of vehicle weight measurement, the vehicle is brought into a running state suitable for weight measurement on a weighing platform. It is an object of the present invention to provide a vehicle weight measuring device that can give information to a driver.

In order to achieve the above object, a vehicle weight measuring device according to the present invention comprises:
In a vehicle weight measuring device that measures the weight of a vehicle while running the vehicle on a weighing platform,
A controller in which an allowable upper limit speed suitable for measuring the weight of a vehicle having the vehicle type determined in advance for each vehicle type is set;
Vehicle type reading means for reading the vehicle type of the vehicle that is about to enter the weighing table in the vicinity of the approach path on the near side of the weighing table for allowing the vehicle to enter the weighing table, and a vehicle for detecting the speed of the vehicle a speed detecting means, provided with a,
And the allowable upper limit speed corresponding to a vehicle type read by the vehicle type reading means, wherein the vehicle speed detected by the vehicle speed detecting means, based on a suitable vehicle to run on the weight measurement on the weighbridge An information display means for displaying information related to the vehicle speed for leading to a state is provided in the vicinity of the approach path (first invention).

In the controller, an appropriate allowable lower limit speed is set according to the number of vehicles to be measured or the measurement time zone,
The information related to the vehicle speed is preferably information on an appropriate range including an allowable upper limit speed and an allowable lower limit speed of a vehicle entering the weighing platform (second invention).

When the vehicle speed detecting means detects that the vehicle speed deviates from the appropriate range, a warning signal is preferably output to the information display means ( third invention).

Furthermore, a vehicle entry stopping means is provided at a position near the weighing platform for preventing entry of the vehicle when the vehicle attempts to enter the weighing platform at a vehicle speed exceeding the allowable upper limit speed. Good ( fourth invention).

According to the present invention, the allowable upper limit speed set in the controller corresponding to the vehicle type read by the vehicle type reading means and the vehicle speed detecting means provided in the vicinity of the approach path for entering the vehicle on the weighing platform are detected. is, on the basis of the vehicle both the speed of vehicles traveling approach path, information relating to the vehicle speed for directing a suitable running state to weighing the vehicle on the weighbridge is displayed on the information display means Given to the driver of the vehicle. Accordingly, it is possible to prompt the driver to perform an appropriate brake operation / accelerator operation, and to guide the vehicle into a suitable traveling state on the weighing platform. As a result, an error can be prevented from occurring in the weight measurement result, and the measurement accuracy can be improved. In addition, since the number of vehicles that need to be re-weighed is greatly reduced, the weight measurement result is improved.

  If the structure of 2nd invention is employ | adopted, the suitable range (upper limit and lower limit of vehicle speed) suitable for weight measurement can be displayed on the said information display means with a vehicle speed. For this reason, the vehicle is adjusted to a speed suitable for weight measurement, such as whether or not the vehicle is traveling within the appropriate range, and how much the vehicle speed can be increased or decreased within the appropriate range. More detailed and objective information can be provided to the driver. As a result, it is possible to prompt the driver to operate the accelerator / brake more appropriately, and the vehicle speed can be more reliably guided into the appropriate range, so that the vehicle enters the weighing platform at a speed outside the appropriate range. Can be prevented. Therefore, the vehicle enters the weighing platform at a speed exceeding the upper limit of the vehicle speed and a large error occurs in the weight measurement result, or the vehicle enters the weighing platform at a speed lower than the lower limit of the vehicle speed and the weight measurement is delayed. Can be reliably prevented.

If the configuration of the third invention is adopted, when the vehicle tries to enter the weighing platform at a speed out of the proper range, an alarm signal is output to the information display means, and the driver is Since it is possible to warn to observe the proper range in the measurement, it is possible to prevent a similar mistake from recurring and to prevent the weight measurement from being prolonged.

If the configuration of the fourth invention is adopted, a vehicle traveling at a vehicle speed large enough to cause an error in the weight measurement result is semi-forcedly stopped in front of the weighing platform, and then enters the weighing platform at a moderate speed. Therefore, even if the vehicle travels at a high vehicle speed, it is possible to prevent an error from occurring in the weight measurement result. In addition, since a method of temporarily stopping and entering the weighing platform is adopted, there is an effect that the delay of the weight measurement can be reduced as compared with performing the weighing again.

  Next, specific embodiments of a vehicle weight measuring device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a vehicle weight measuring device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a system configuration of the vehicle weight measuring device of the present embodiment.

  The vehicle weight measuring device 1 according to the present embodiment stops the weight measurement of the vehicle 2 traveling from the front side (left side in FIG. 1) to the back side (right side in FIG. 1) of the weighing platform 3 without stopping. It can be done with. In addition, although it does not specifically limit as a form of the vehicle 2 which is the object of weight measurement, in the following description, three axles 2a, 2b, 2c ("one axle 2a" in order from the first axle, An example of measuring the weight of the vehicle 2 having “2-axis 2b” and “3-axis 2c”) will be described.

  As shown in FIG. 1, the vehicle weight measuring device 1 is manufactured to a size that allows the entire vehicle 2 to be placed, and a pit formed by digging down the road has an upper surface substantially flush with the road surface. A total of four weighing tables 3 arranged in this manner and provided at the lower four corners of the weighing table 3 to support the weighing table 3 and output a load signal corresponding to the load applied to the weighing table 3 Load cells 4a to 4d, and a controller 5 having various calculation functions such as measuring the weight of the vehicle 2 in the running state on the weighing platform 3 mainly based on load signals output from the load cells 4a to 4d. ing.

  An IC tag reader 7 is installed on the front side of the weighing table 3 and on the side of the approach path L following the weighing table 3. The IC tag reader 7 has a vehicle in a slightly forward position. A first vehicle speed detector (vehicle speed detection means) 8 is provided for detecting a second speed (“first vehicle speed”) at a position relatively distant from the weighing platform 3. Further, a first information display monitor 9 for displaying the first vehicle speed and the like is installed in front of the first vehicle speed detector 8, and further forward of the first information display monitor 9. Is provided with a second vehicle speed detector (vehicle speed detecting means) 10 for detecting the speed of the vehicle 2 (referred to as “second vehicle speed”) at a position relatively close to the weighing platform 3. Yes. Furthermore, when the detection result by the second vehicle speed detector 10 exceeds a required speed (allowable upper limit speed described later) at a position immediately before the weighing table 3, the vehicle 2 is moved onto the weighing table 3. A breaker (vehicle stopping means) 11 for stopping entry is provided, and a second information display monitor 12 for displaying various information such as second vehicle speed and various messages such as warnings in front of the weighing table 3. Is provided. The IC tag reader 7, the first vehicle speed detector 8, the second vehicle speed detector 10, the first information display monitor 9, the second information display monitor 12, and the drive unit 11 of the circuit breaker 11. 'Is connected to the controller 5 respectively.

  The IC tag reader 7 reads vehicle body information stored in an IC tag attached to the passing vehicle 2 when the vehicle 2 as a weight measurement object passes in front of the IC tag reader 7, and sends it to the controller 5. Have been to send. Here, the vehicle body information stored in the IC tag includes at least a vehicle identification number and a vehicle body type (model number) assigned to each vehicle, and the vehicle body information is read by the IC tag reader 7. When the vehicle body identification number is recognized, it is prepared for the weight measurement of the vehicle 2 corresponding to the vehicle body identification number.

  The first vehicle speed detector 8 disposed slightly in front of the IC tag reader 7 has a pair of tape switches 8a disposed so as to cross the approach path L with a required interval P therebetween. , 8b. These tape switches 8a and 8b have mechanical contacts incorporated therein, and when the wheels of the vehicle 2 step on the tape switches 8a and 8b, the contacts are turned on and the contact signals are transmitted to the controller 5. It has come to be. The controller 5 receives a contact signal from the tape switch 8a on one side (away from the weighing table 3) and then receives a contact signal from the tape switch 8b on the other side (closer to the weighing table 3). The vehicle speed at the time of passing through the first vehicle speed detector 8 is obtained based on the time until and the distance P between the tape switches 8a and 8b.

  The first information display monitor 9 is displayed between the first vehicle speed detector 8 and the weighing platform 3 by the driver of the vehicle 2 that has passed the first vehicle speed detector 8. Is provided at a position where it can be easily recognized, and in addition to the first vehicle speed detected by the first vehicle speed detector 8, an allowable lower limit speed and an allowable upper limit speed are displayed. . Here, the allowable upper limit speed is a value determined for each vehicle body type of the vehicle 2, and is set mainly based on the load weight that can be loaded and the size of the distance between the axles. Specifically, the greater the load weight to be loaded and the shorter the distance between axles, the greater the error in weight measurement. A small value is set as the allowable upper limit speed. On the other hand, the allowable lower limit speed is a value set in order to efficiently perform the weight measurement of a large number of vehicles 2 within a finite time, and can be performed by an operator or the like depending on the number of vehicles to be measured and the measurement time zone. Set arbitrarily. Then, the driver of the vehicle 2 refers to the display content of the first information display monitor 9 and performs an accelerator operation / brake operation so that the vehicle speed of the vehicle 2 falls within a speed range between the allowable upper limit speed and the allowable lower limit speed. To come in.

  Similar to the first vehicle speed detector 8, the second vehicle speed detector 10 is composed of two pairs of tape switches 10a and 10b spaced apart from each other by a required distance P. A (second) vehicle speed at a target position is detected and supplied to the controller 5. If the second vehicle speed detector 10 detects a value exceeding the allowable upper limit speed, the speed of the vehicle 2 is adjusted to an appropriate and stable speed until the vehicle 2 reaches the weighing platform 3. In such a case, it is difficult to obtain a good measurement result with little error. In such a case, the second information display monitor 12 displays a command for temporarily stopping the vehicle, or the A system is adopted in which the breaker 11 is lowered to temporarily stop the vehicle 2 and enter the vehicle 2 into the weighing table 3 at a moderate speed to obtain a measurement result with a small error. On the contrary, when the vehicle speed of the vehicle 2 is less than the allowable lower limit speed, it is not preferable from the viewpoint of the efficiency of vehicle weight measurement, but the accuracy of the weight measurement itself is rather improved. While measuring the vehicle weight while maintaining the speed, the second information display monitor 12 displays an alarm indicating that the speed is observed, alerts the driver of the vehicle 2, and repeats the same mistake. It is to prevent.

  The controller 5 displays the input unit 13 including various input means such as key switches for inputting setting data and various operation commands, and the measurement results, setting data, storage data, and the like to the operator. A display unit 14 is provided for this purpose.

  As shown in FIG. 2, the controller 5 amplifies the load signals input from the load cells 4a to 4d, and converts output signals from the amplifiers 15a to 15d into digital signals. A / D converters 16a to 16d are provided.

  In addition to the digital signals converted by the A / D converters 16a to 16d, the vehicle body information in the IC tag read by the IC tag reader 7, the first speed detector 8 and the second speed detection Each vehicle speed information detected by the device 10 and an input signal from an input unit 13 such as a key switch are supplied to an arithmetic processing unit (CPU) 18 via an I / O circuit 17. Each of the amplifiers 15a to 15d itself may be provided with an analog filter, or an analog filter may be provided before and after each of the amplifiers 15a to 15d.

  The arithmetic processing unit 18 measures the weight of the vehicle 2 traveling on the weighing platform 3 based on the load signals output from the load cells 4a to 4d and converted into digital signals by the A / D converters 16a to 16d. It has a function of executing a predetermined program and performing a predetermined arithmetic process such as obtaining as a value. The arithmetic processing unit 18 is connected to a memory 19 composed of a ROM, RAM, EEPROM or the like for temporarily or semi-permanently storing an arithmetic program, setting data, and arithmetic data. And the calculation result by the arithmetic processing unit 18, the command signal based on it, etc., the first and second information display monitors 9, 12, the display unit 14 and the drive unit 11 ′ of the circuit breaker 11 according to their contents. Is output.

  Next, the operation of the vehicle weight measuring device 1 configured as described above will be described.

  First, the number of axles, the distance between axles, and the specifications of the weight of the main body and the distance P between the tape switch 8a (10a) and the tape switch 8b (10b) of each vehicle speed detector 8 and 10 are measured. It is set in advance and registered in the memory 19.

  Next, an appropriate allowable lower limit speed is input from the key switch of the input unit 13 and registered in the memory 19 according to the number of vehicles to be measured, the measurement time zone, and the like. Since the appropriate value of the allowable lower limit speed varies depending on the number of vehicles to be measured and the measurement time zone, it is possible to arbitrarily set numerical values with the key switch of the input unit 13, for example, the number of vehicles to be measured is relatively When the number is small or when the measurement time has a margin, it is set to 3 km / h, and when the number of measurement vehicles is large, it is set to 5 km / h. The allowable lower limit speed set in this way is supplied to the first information display monitor 9 via the I / O circuit 17, and the same value regardless of the vehicle type is given to a required portion of the first information display monitor 9. Is displayed.

  When the vehicle 2 passes in front of the IC tag reader 7, vehicle body information (vehicle body type, vehicle identification number, vehicle body weight, etc.) of the IC tag provided in the vehicle 2 is read and transmitted to the controller 5. . And a vehicle identification number is read by the controller 5, and it prepares for the weight measurement with respect to the vehicle 2 applicable to the vehicle identification number. Specifically, body information such as the number of axles of the vehicle 2 that has passed in front of the IC tag reader 7 and the distance between the axles is determined based on the body type transmitted to the controller 5 and the registered specification list. A permissible upper limit speed suitable for measuring the weight of the vehicle 2 is determined and supplied to the first information display monitor 9 and displayed together with the number of axles of the vehicle 2.

  When the wheel of the single shaft 2a of the vehicle 2 that has passed in front of the IC tag reader 7 steps on the tape switches 8a and 8b of the first vehicle speed detector 8 (see arrow A in FIG. 1), the tape switch. Contact signals are transmitted to the controller 5 from 8a and 8b. In the controller 5, the generation time intervals of the contact signals respectively transmitted from the tape switches 8a and 8b are counted with a sufficiently short fixed time interval (for example, 1 msec) by the arithmetic circuit in the arithmetic processing unit 18, and the vehicle 2 A measured value t1 (msec) of the vehicle passing time from passing through one tape switch 8a until passing through the other tape switch 8b is obtained. Based on this measured value t1 and the distance P between the tape switches 8a and 8b, the first vehicle speed V1 of the vehicle 2 traveling at a position relatively distant from the weighing platform 3 is expressed by the equation V1 = P / t1. Desired.

  The first vehicle speed V1 thus determined is converted to a unit of km / h, and is supplied to the first information display monitor 9 and displayed together with the vehicle identification number.

  At this time, since the vehicle identification number, the number of axles, the first vehicle speed V1, the allowable upper limit speed, and the allowable lower limit speed of the vehicle 2 are displayed on the first information display monitor 9, The driver can easily confirm whether or not the current vehicle speed is at an appropriate speed (a speed between the allowable upper limit speed and the allowable lower limit speed). When the vehicle speed is within the appropriate range, the vehicle 2 is advanced toward the weighing platform 3 while maintaining the speed. On the other hand, if the vehicle speed is not an appropriate speed, the driver of the vehicle 2 is made to perform an accelerator / brake operation, and the driver is instructed to keep the vehicle speed within an appropriate range. That is, when the vehicle speed exceeds the allowable upper limit speed, the red lamp is turned on, and when the vehicle speed is lower than the allowable lower limit speed, the yellow lamp is turned on.

  Further, in order to distinguish between the vehicle 2 to be measured and the following vehicle, contact signals are transmitted from the tape switches 8 a and 8 b of the first vehicle speed detector 8 to the memory 19 of the controller 5. A counter Cw that counts the number of contact signal transmissions is provided each time. The counter Cw has an initial value set to 0, and each time the wheels of the axles 2a to 2c step on the tape switches 8a and 8b, and contact signals are transmitted from the tape switches 8a and 8b to the controller 5, Counts up by +1. In the case where the vehicle 2 has three axes as in the present embodiment, when the counter Cw reaches the number (= 6) obtained by multiplying the number of axles by 2, all the axles 2a to 2c have the first speed. It is determined that the detector 8 has been passed, Cw is reset to 0, and is prepared for the weight measurement of the following vehicle. Thus, it can be clearly distinguished whether the wheel of the vehicle 2 has stepped on the tape switches 8a and 8b or the wheel of the following vehicle.

  In the present embodiment, the first is based on the contact signal transmitted when the wheel of the single shaft 2a of the vehicle 2 steps on the tape switches 8a and 8b (that is, when the value of the counter Cw is 1 or 2). Since the vehicle speed V1 of the vehicle is taken, when the wheels of the 2-axis 2b and 3-axis 2c step on the tape switches 8a, 8b, that is, when the value of the counter Cw is 3 to 6, Such a vehicle speed detection calculation is not performed, but each time the axles 2a to 2c step on the tape switches 8a and 8b, the vehicle speed is obtained, and the average value of these vehicle speeds is used as the first vehicle speed. A method can also be adopted.

  Further, in the present embodiment, when the first vehicle speed V1 of the vehicle 2 is detected, the vehicle identification number, the allowable upper limit speed, and the allowable lower limit speed of the vehicle 2 are stored at the end of the shift register provided in the memory 19. It is temporarily stored in the tail memory area.

  Here, the shift register is composed of a plurality of memory areas provided in preparation for the case where a plurality of vehicles exist between the first vehicle speed detector 8 and the second vehicle speed detector 10. The vehicle identification number, the allowable upper limit speed, and the allowable lower limit speed of each vehicle in which the first vehicle speed is detected and the second vehicle speed is not detected are stored in the respective memory areas. What is stored to be equal. This shift register erases the vehicle identification number and the like in the head memory area every time the second vehicle speed detector 10 detects the second vehicle speed V2 and performs a determination calculation described later. All the remaining vehicle identification numbers and the like are sent one memory area ahead.

  The vehicle 2 in which the first vehicle speed V1 is detected and the speed is adjusted (in some cases) is stepped on the tape switches 10a and 10b of the second vehicle speed detector 10 (see arrow B in FIG. 1). ), The (second) vehicle speed V2 is detected at the position where the second vehicle speed detector 10 is disposed (the description is omitted because it is the same as the detection of the first vehicle speed V1). In this situation, all the preceding vehicles of the vehicle 2 have completed the second vehicle speed detection and determination calculation (described later). 2 vehicle identification numbers and the like are stored.

  When the second vehicle speed V2 is detected, a comparison is made between the second vehicle speed V2 and an allowable upper limit speed and an allowable lower limit speed stored in the memory area at the head of the shift register. A determination calculation is performed as to whether or not the vehicle speed V2 is within an appropriate speed (a speed between the allowable upper limit speed and the allowable lower limit speed). When the determination calculation is completed, the second vehicle speed V2 and the allowable upper limit speed and the allowable lower limit speed stored in the memory area at the head of the shift register are output and displayed on the second information display monitor 12.

  Here, when the second vehicle speed V2 is within the allowable lower limit speed and the allowable upper limit speed, it is determined that the vehicle travels to the weighing table 3 at a speed suitable for weight measurement. In this case, the vehicle 2 is placed on the weighing platform 3 while maintaining the current speed (second vehicle speed V2). In the controller 5, a required program is executed based on the load signals from the load cells 4a to 4d, and the vehicle weight (measured value) of the vehicle 2 is obtained.

  When the second vehicle speed V2 exceeds the allowable upper limit speed, it is not possible to obtain a measured value with sufficient accuracy even if the second vehicle speed V2 gets on the weighing table 3 at the same speed. In addition, since the second vehicle speed V2 is a vehicle speed of a vehicle traveling in a relatively close position of the weighing platform 3, even if a brake operation or the like is performed after detection of the second vehicle speed V2. It is no longer possible to get on the weighing platform 3 at a stable vehicle speed, and it is impossible to obtain a weighing value with sufficient accuracy. Therefore, when the second vehicle speed V2 exceeds the allowable upper limit speed, a closing signal is transmitted to the drive unit 11 ′ of the breaker 11, the breaker 11 is lowered, and the vehicle 2 is forced halfway temporarily. After stopping, an open signal is transmitted to the drive unit 11 ′ to raise the circuit breaker 11, allowing the vehicle 2 to enter the weighing table 3 at a moderate speed, and the controller 5 allows the vehicle to The measurement value of 2 is obtained. Instead of lowering the circuit breaker 11, or while lowering the circuit breaker 11, a command may be displayed on the second information display monitor 12 to temporarily stop before the weighing table 3.

  If the second vehicle speed V2 greatly exceeds the allowable upper limit speed, it is impossible to stop the vehicle before the weighing platform 3, and even if the breaker 11 is lowered, the vehicle stops before the weighing platform 3. Since it is not always possible, in such a case, without taking off the circuit breaker 11, let the vehicle 2 pass through the weighing platform 3, and “re-weigh” on the second information display monitor 12. Display text and prompt re-weighing.

  Further, when the second vehicle speed V2 is lower than the allowable lower limit speed, the accuracy of the weight measurement is rather improved, so that the weighing platform 3 at the second vehicle speed V2 lower than the allowable lower limit speed is obtained. And the controller 5 determines the measured value. However, if there are many vehicles that fall below the allowable lower limit speed, it will lead to a delay in the weight measurement. Therefore, a voice such as “Please observe the vehicle speed during weighing” or the speed of the second information display monitor 12 is used. By flashing the display, a warning is issued to the driver of the vehicle 2 whose weight has been measured at a speed lower than the allowable lower limit speed, and attention is given so as not to recur the same mistake.

  On the other hand, in the controller 5, in order to prepare for the second vehicle speed detection and determination calculation for the following vehicle, the vehicle identification number stored in the first memory area of the shift register after the determination calculation of the vehicle 2 is completed. Etc. are erased, and the vehicle identification numbers and the like stored in the remaining memory areas are sent by the memory area one car ahead and are prepared for the weight measurement of the following vehicle.

  The measured value of the vehicle 2 obtained as described above is output to the display unit 14 and a printer (not shown) to be provided to the operator / driver, and is stored in the storage area for data management in the memory 19 together with the vehicle body information. Recorded and managed.

  In the present embodiment, the first vehicle speed detector 8 detects the vehicle speed (first vehicle speed V1) of the vehicle 2 traveling at a position relatively distant from the weighing platform 3, and this first vehicle. The speed V1, the allowable lower limit speed, the allowable upper limit speed, and the like are displayed on the first information display monitor 9 and given to the driver of the vehicle 2. For this reason, even if the first vehicle speed V1 deviates from the appropriate speed, the vehicle 2 may vary by performing the accelerator operation / brake operation while referring to the display content of the first information display monitor 9. Therefore, it can be guided onto the weighing table 3 in a speed state suitable for measuring the vehicle weight with little. As a result, the measured value of the vehicle 2 in the traveling state can be obtained with sufficient accuracy. In addition, since the number of vehicles that get on the weighing platform 3 at a vehicle speed that is out of the proper range is reduced, the time loss is naturally reduced, so that the efficiency of the overall vehicle weight measurement can be improved.

  In the present embodiment, when the second vehicle speed detector 10 in the vicinity of the weighing platform 3 detects the second vehicle speed V2 exceeding the allowable upper limit speed, the circuit breaker 11 is lowered and the vehicle 2 is moved down. After stopping the vehicle, the vehicle is placed on the weighing platform 3 at a moderate speed, so that the vehicle speed (second vehicle speed V2) at a relatively close position of the weighing platform 3 exceeds the allowable upper limit speed. Even when it is, a sufficiently accurate measurement value can be obtained. For this reason, even when the second vehicle speed V2 of the vehicle 2 exceeds the allowable upper limit speed, there is basically no need to perform reweighing. As a result, the vehicle weight measurement can be speeded up as a whole.

  On the contrary, even if the second vehicle speed detector 10 detects the second vehicle speed V2 that is lower than the allowable lower limit speed, the second vehicle speed detector 10 gets on the weighing platform 3 at the vehicle speed V2 as it is. Since weight measurement is performed, there is an effect that time loss is reduced as compared with the case of reweighing. In such a case, the driver of the vehicle 2 that has entered the weighing platform at a speed lower than the second vehicle speed V2 is audible, and the speed display on the second information display monitor 12 is flushed. Since the warning is given so as to comply with the appropriate speed, the same mistake can be prevented from recurring, and the weight measurement can be prevented from being delayed.

  In the present embodiment, the first vehicle speed detector 8 and the first information display monitor 9, the second vehicle speed detector 10 and the second information display monitor 12 are used to instruct speed adjustment and the weighing platform. Although the entry into the weighing platform 3 is regulated, either one of the speed detector 8 (10) and the information display monitor (9) 12 is used to regulate the speed or to regulate the entry into the weighing platform 3. Can also be adopted.

  In the present embodiment, the first and second vehicle speed detectors 8 and 10 have been described using two pairs of tape switches 8a and 8b; 10a and 10b. For example, other types of detection means may be used.

  In the present embodiment, as means for transmitting vehicle body information to the weight measuring device 1, an IC tag attached to each vehicle and an IC tag reader 7 for reading the IC tag are used. It is also possible to use a wireless communication means.

  In the present embodiment, the allowable lower limit speed is determined based on the number of units to be measured, the measurement time zone, etc., regardless of the vehicle type. In order to protect the vehicle, it may be set according to the vehicle type, such as a larger value for longer vehicles.

  Furthermore, in this embodiment, although the vehicle weight measuring apparatus 1 having the weighing platform 3 having a size in which the entire vehicle 2 is mounted has been described, the weighing platform in which the dimension in the traveling direction of the vehicle is slightly longer than the dimension of the grounding portion of the wheel. The concept of the present embodiment can be applied even to a weight measuring device using the.

  Furthermore, speed detecting means for detecting whether or not the vehicle speed is below the allowable lower limit speed may be installed on the weighing table 3.

1 is a schematic configuration diagram of a vehicle weight measuring device according to an embodiment of the present invention. The block diagram which shows the system configuration | structure of the vehicle weight measuring apparatus of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle weight measuring apparatus 2 Vehicle 3 Weighing platform 4a-4d Load cell 5 Controller 8 1st vehicle speed detector 9 1st information display monitor 10 2nd vehicle speed detector 11 Breaker 11 'Drive unit 11'
12 Second information display monitor 18 Arithmetic processor 19 Memory

Claims (4)

In a vehicle weight measuring device that measures the weight of a vehicle while running the vehicle on a weighing platform,
A controller in which an allowable upper limit speed suitable for measuring the weight of a vehicle having the vehicle type determined in advance for each vehicle type is set;
Vehicle type reading means for reading the vehicle type of the vehicle that is about to enter the weighing table in the vicinity of the approach path on the near side of the weighing table for allowing the vehicle to enter the weighing table, and a vehicle for detecting the speed of the vehicle a speed detecting means, provided with a,
And the allowable upper limit speed corresponding to a vehicle type read by the vehicle type reading means, wherein the vehicle speed detected by the vehicle speed detecting means, based on a suitable vehicle to run on the weight measurement on the weighbridge An apparatus for measuring vehicle weight, characterized in that information display means for displaying information related to a vehicle speed for leading to a state is provided in the vicinity of the approach path. In the controller, an appropriate allowable lower limit speed is set according to the number of vehicles to be measured or the measurement time zone,
The vehicle weight measuring device according to claim 1, wherein the information related to the vehicle speed is information on an appropriate range including an allowable upper limit speed and an allowable lower limit speed of a vehicle entering the weighing platform.   The vehicle weight measuring device according to claim 1, wherein a warning signal is output to the information display means when the vehicle speed detection means detects that the vehicle speed deviates from the appropriate range.   2. A vehicle entry stopping means for stopping entry of the vehicle when the vehicle is about to enter the weighing table at a vehicle speed exceeding the allowable upper limit speed at a position near the weighing table. 4. The vehicle weight measuring device according to any one of 3.

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