JPH0949752A - Weight measuring apparatus for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weight measuring apparatus for a vehicle to be mounted at the vehicle to accurately and easily measure the weight of the vehicle having an air suspension. SOLUTION: The weight measuring apparatus for a vehicle comprises pressure measuring means 2 for measuring the pressure in an air suspension, and gross weight deciding means for deciding the gross weight of the vehicle at the time point from the measured pressure, wherein the deciding means has differential pressure deciding means for comparing the measured pressure with an initial pressure to decide the differential pressure, and weight difference deciding means for deciding the weight difference corresponding to the decided differential pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle weight measuring device for measuring the weight of a vehicle of a type suspended by an air suspension.

[0002]

2. Description of the Related Art As a device for measuring the weight of a load loaded on an automobile, that is, a loaded weight, a stationary type weighing scale for a vehicle or a weighing scale using a strain gauge, etc., can be attached to the vehicle. Are known.

[0003]

However, the stationary type vehicle weighing scale, which is commonly called "can-can", has the problems that it cannot measure at the destination and the facility cost is high, and the strain gauge type has a sensor. It requires a great deal of labor for installation and maintenance of the components and the like, and also requires technical knowledge, resulting in high cost, and it is practically impossible to mount it on all vehicles.

Further, the technique of Japanese Patent Laid-Open No. 6-273217 is disclosed, but it relates to an improvement of a system in which a conveyor is provided on a loading platform of a vehicle and a weight is measured while moving a load on the conveyor. However, this does not solve the problem of the present application.

Therefore, it is an object of the present invention to provide a vehicle weight measuring device for mounting on a vehicle, which accurately and easily measures the weight of a vehicle having an air suspension.

[0006]

According to the present invention, in a vehicle weight measuring device for measuring the weight of a vehicle of a type suspended by an air suspension, pressure measuring means for measuring the pressure in the air suspension, and A weight determining means for determining the weight of the vehicle at that time from the applied pressure, the weight determining means storing the initial weight of the vehicle whose weight is to be measured and the initial pressure of the air suspension; A differential pressure determining means for comparing the measured pressure and the initial pressure to determine the differential pressure, a weight difference determining means for determining the weight difference corresponding to the determined differential pressure, and the determined weight difference and the initial weight. And present weight determining means for determining the present weight.

Further, according to the present invention, the weight difference determining means determines the weight difference corresponding to the differential pressure using a map created in advance.

Further, according to the present invention, there is provided weight display means for displaying the weight determined by the weight determination means.

[0009]

The present invention is configured as described above.
If a map (characteristic diagram or mathematical expression) that shows the relationship between the pressure difference between the bellows of the air suspension and the initial pressure and the weight difference is stored in advance, the pressure of the bellows is measured and the difference from the initial value is measured. If the pressure is calculated and determined, the corresponding weight difference can be determined from the above map, so that the total vehicle weight can be calculated from the weight difference and the initial weight.

Further, if the initial weight is set as the empty weight of the vehicle, the weight value corresponding to the pressure of the bellows becomes the total weight, and the weight difference calculated from that becomes the loaded weight, which is convenient.

A pressure sensor is attached to the bellows,
Since the weight determining means may be provided on the vehicle, the mounting work and maintenance are extremely easy as compared with the conventional measuring method using the strain gauge, and the cost is practical including the cost.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an essential part of a vehicle weight measuring apparatus according to the present invention. One end of a bellows 5 of an air suspension is attached to a frame 15 via a bracket 9 attached with a rivet 11. , The other end is fixed to one end of the leaf spring 8 together with an axle (not shown), and the other end of the leaf spring 8 is attached to the frame 1
It is rotatably attached to a spring bracket 10 provided at 5. An air tube 4 is connected to one end of the bellows 5 via a three-way connector 3, and a pressure sensor 2 for detecting the pressure of the bellows 5 is attached to the three-way connector 3, and the pressure sensor 2 is an electric circuit. Is connected to the controller 1. The controller 1 has a display device 6 and a controller 1.
Is connected to an input means 7 for inputting data by an electric circuit.

FIG. 2 is a block diagram of the processing of the apparatus of FIG. 1, in which an initial value input section 20 for inputting an initial value in advance and a pressure measuring means 21 for measuring an air pressure by receiving a pressure signal from the sensor 2. A differential pressure determining means 22 for determining a pressure difference from the initial pressure and the measured pressure; and a current weight determining means 23 for determining a weight difference from the pressure difference and determining a current weight from the initial weight and the weight difference. It is composed of a data output processing unit 24 and a display unit 6.

The operation will be described below with reference to the control flowchart of FIG.

In operation, it is first determined whether the vehicle speed is zero (step S1). If NO, the process returns, and if YES, it is determined whether the initial value input is completed (step S2). In the case of NO, the initial air pressure value and the initial weight value are read (steps S3 and 4), and the initial pressure and the weight value are recorded (step S5). If YES, the air pressure value is read (step S6), the initial pressure value is read (step S7), the pressure difference is calculated and determined (step S8), and the table (characteristic value, mathematical expression, etc.) may be obtained from the pressure difference. To determine the weight difference (step S9), read the initial weight value (step S10), determine the current weight (step S11), perform data output preprocessing (step S12), and display it on the display device 6 (step S12). S13),
Data is output if necessary (step S14), and the control is ended by returning.

Therefore, the weight (carrying weight, gross vehicle weight) of a vehicle having an air suspension can be known anytime, anywhere with a simple device.

[0018]

The present invention is configured as described above,
The following excellent effects can be achieved. (1) Since the air pressure sensor and the controller are attached to the vehicle, the weight can be measured regardless of the place and time. (2) The sensor is easy to install and maintain and is easy to handle. (3) Therefore, the cost is low and it can be attached to a large number of vehicles, which is practical.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a weight measuring device according to an embodiment of the present invention.

FIG. 2 is a block diagram of processing of the apparatus of FIG.

FIG. 3 is a flowchart of control of the apparatus shown in FIG.

[Explanation of symbols]

 1 ... Controller 2 ... Pressure sensor 3 ... Three-way connector 4 ... Air tube 5 ... Bellows 6 ... Display device 7 ... Data input means 8 ... Leaf spring 9. ..Bracket 10 ... Spring bracket 15 ... Frame

Claims (3)

[Claims] 1. A vehicle weight measuring device for measuring the weight of a vehicle of a type suspended by an air suspension, comprising: a pressure measuring means for measuring the pressure in the air suspension; and the weight of the vehicle at that time based on the measured pressure. And a weight determining means for determining the weight, the weight determining means storing the initial weight of the vehicle whose weight is to be measured and the initial pressure of the air suspension.
A differential pressure determining means for comparing the measured pressure and the initial pressure to determine the differential pressure, a weight difference determining means for determining the weight difference corresponding to the determined differential pressure, and the determined weight difference and the initial weight. And a current weight determining means for determining the current weight of the vehicle. 2. The vehicle weight measuring apparatus according to claim 1, wherein the weight difference determining means determines the weight difference corresponding to the differential pressure using a map created in advance. 3. The vehicle weight measuring device according to claim 1, further comprising weight display means for displaying the weight determined by the weight determining means.