JP2007206003A - Loadage detector of air suspension vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detector with simple constitution capable of precisely grasping the weight of load, independently of the loading patterns of the load. <P>SOLUTION: In the air suspension vehicle, having at least a suspension device of a rear axle constituted of an air spring, the air suspension vehicle is provided with a pressure sensor 1 outputting a signal, corresponding to the pressure of the air spring of the rear axle; a memory 3 storing the plurality of loading patterns on a bed; a calculation means 6 calculating the weight of load on the basis of the rear axle weight, calculated on the basis of the output signal of the pressure sensor and the loading pattern specified by an operator; and a display means 5 displaying the weight of load calculated by the calculation means 6, thereby predicting and detecting more accurate load amount and so forth, based on only the pressure of the air spring for suspending the rear axle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a load detection device for an air suspension vehicle in which at least a rear shaft suspension device is composed of an air spring, and more particularly to a detection device that can accurately grasp a load weight while being a simple configuration. is there.

  As a conventional example of a load detection device for detecting the load weight of a truck or the total weight of a vehicle, for example, as shown in Patent Document 1, the vehicle weight is detected based on an accelerator opening, an engine speed, a vehicle speed, and the like. There are those that have been made, or those that are calculated based on the amount of displacement of the spring that suspends the axle as disclosed in Patent Document 2.

  However, in the case where the vehicle weight is detected based on the accelerator opening, the engine speed, the vehicle speed, and the like as shown in Patent Document 1, the weight is detected only in the running state. It is difficult to prevent overloading in the loading process, and the vehicle weight is calculated based on the displacement amount of the spring that suspends the axle as shown in Patent Document 2, There is a problem that the exact weight cannot be detected unless the loading pattern is made constant.

  In other words, for example, the entire truck bed is divided into two parts on the left and right sides, and the length of the carrier bed from the front end to the rear end of each of the left and right areas is divided equally. Suppose that the load source with the same weight is loaded evenly. And when the loading order to each division area is shown by a number, the loading pattern to the loading platform is a loading pattern that loads in order from the loading platform front to the rear as shown in FIG. As shown in (B), the post-loading pattern is loaded in order from the rear of the loading platform toward the front, and the front of the opposite side after loading from the front of the loading platform to the rear as shown in FIG. It is divided roughly into a single stacking pattern that loads from the rear toward the rear. In the figure, CAB indicates a cab of a track.

  In this way, the loading pattern is roughly divided into three, the rear shaft suspension device is composed of an air spring, and the output voltage of the pressure sensor that detects the pressure of the air spring as a signal that responds to the rear shaft axle load is When used, in the pre-stacking pattern shown in FIG. 2 (A), since the load ratio of the front shaft is large and the load ratio of the rear shaft is small at the beginning of loading, as shown by the solid line in FIG. On the other hand, the increase rate of the output voltage of the pressure sensor gradually increases with the increase of the loading capacity. Conversely, in the post-loading pattern shown in FIG. 2B, the load ratio of the front shaft becomes extremely small at the beginning of loading. Since the load ratio of the rear shaft is large, the increase ratio of the output voltage of the pressure sensor is gradually reduced with respect to the increase of the load as shown by the two-dot chain line in FIG. In addition, in the single-stack pattern illustrated in FIG. 2C, the state is repeated again after the output voltage of the pressure sensor gradually decreases as shown by the broken line in FIG. Similar characteristics appear repeatedly. When the load is a fluid or a semi-fluid, the rate of increase in the front axle load and the rear axle weight is different from that of both.

Therefore, if the load weight is calculated (estimated) based only on the output signal of the air spring that suspends the rear shaft as a signal corresponding to the amount of displacement of the spring that suspends the rear shaft, a reduction in the calculation accuracy can be avoided. I can't. In order to avoid such problems, the rear axle weight and the front axle weight can be measured to determine the total weight from these axle weights. In this case, it is necessary to install a large number of sensors. There is a concern that the cost will be high.
Japanese Utility Model Publication No. 5-84834 JP-A-8-304154

  The problem to be solved is that it is impossible to implement a detection device with a simple configuration that can accurately grasp the loaded weight regardless of the loading pattern of the load.

  According to the present invention, in an air suspension vehicle in which at least a rear shaft suspension device is configured by an air spring, a pressure sensor that outputs a signal corresponding to the pressure of the rear shaft air spring and a plurality of loading patterns on the loading platform are stored. Memory, calculation means for calculating the loaded weight based on the rear axle weight calculated based on the output signal of the pressure sensor and a loading pattern designated by the operator, and display means for displaying the loaded weight calculated by the calculation means The main feature is that it has

  If the loading pattern of the load on the loading platform of the present invention is selected and specified, it is possible to predict and detect a more accurate load weight based only on the pressure of the air spring that suspends the rear shaft. There is an advantage that it becomes possible to prevent overloading accurately.

  FIG. 1 is a conceptual diagram showing an aspect of a load detection device for an air suspension vehicle according to the present invention, and at the output end of a pressure sensor 1 that outputs a signal corresponding to the pressure of an air spring that suspends a rear shaft (not shown). The signal input terminal of the computer 2 is connected. The computer 2 includes a memory 3 in which the correspondence between the magnitude of the output signal of the pressure sensor 1 and the loaded weight is stored for each loading pattern on the loading platform.

  The operation unit 4 of the computer 2 is provided with a power switch 4a and push button switches 4b to 4d for designating a load loading pattern at that time. The display unit 5 of the computer 2 is provided with display windows 5a to 5c for displaying numerical values such as the loaded weight, total vehicle weight, and addable weight at that time. Alternatively, by installing it in the operator's cab, etc., it is possible to easily and accurately confirm the loading pattern and the loading weight at that time.

  The computing unit 6 of the computer 2 reads the conversion parameter corresponding to the loading pattern instructed by the push button switches 4b to 4d from the memory 3, and outputs the output signal of the pressure sensor 1 as a loading weight signal, a vehicle gross weight signal, and an additional signal. It converts into possible weight etc. and outputs it to the display unit 5.

  By the way, a loading pattern changes with loading operators. However, when the operator loads a load pattern to be loaded by the operator using the push button switches 4b to 4d of the operation unit 4, the calculation unit 6 reads the conversion parameter corresponding to the pattern from the memory 3. Based on the conversion parameter and the signal output from the pressure sensor 1, the load weight at that time is calculated, and from this load weight, the total vehicle weight, the addable weight, and the like are calculated, and these numerical values are displayed on the display unit 5. Output to.

  Therefore, since the loading operator can immediately know the loading weight, the total weight of the vehicle, the additional weight, etc. at that time from the display content of the display unit 5, it is possible to reliably avoid overloading and It is possible to plan accurately the loading schedule at the loading site.

  In addition, the rear spring weight, rear spring weight, front spring weight, front spring weight, maximum load capacity, wheelbase, and the length from the center of the loading platform to the front and rear shafts vary depending on the vehicle. Even if the loading pattern is the same, the conversion parameters are different, and the loading pattern is diverse. Therefore, in order to cope with these changes, a plurality of different conversion parameters corresponding to the possible loading patterns and vehicle specifications are prepared in advance, and the conversion parameters suitable for the vehicle are rewritten with an external tool or the like. It becomes possible to apply the load amount detection device to different vehicles.

  In the above embodiment, the vehicle-specific maximum loading capacity is displayed, and the loading weight, total vehicle weight, and addable weight at that time are displayed as numerical values on the display unit. The display form is not limited to that of the embodiment, and can be changed as necessary.

It is a conceptual diagram which shows the one aspect | mode of the loading amount detection apparatus of the air suspension vehicle which concerns on this invention. It is a schematic plan view of the vehicle which illustrated the loading pattern. FIG. 3 is a relationship diagram of a load amount-pressure sensor output voltage according to the loading pattern illustrated in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure sensor 2 Computer 3 Memory 4 Operation part 5 Display part 6 Calculation part

Claims (1)

In an air suspension vehicle in which at least the rear shaft suspension is configured by an air spring, a pressure sensor (1) that outputs a signal corresponding to the pressure of the air spring that suspends the rear shaft, and a plurality of loading patterns on the loading platform are stored. A memory (3), a calculation means (6) for calculating a load weight based on a rear axle weight calculated based on an output signal of the pressure sensor (1) and a loading pattern designated by an operator, and the calculation means ( 6. A load detection device for an air suspension vehicle, comprising display means (5) for displaying the load weight calculated in 6).

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