RU95607U1 - VEHICLE LOAD CONTROL DEVICE - Google Patents

Abstract

 1. Device for monitoring vehicle loading, comprising a weighing unit in the form of a displacement sensor located between the frame and the rear axle of the vehicle, connected to an external electrical device, characterized in that the displacement sensor is inductive with an internal rod and with a primary electrical circuit for signal output, the sensor is placed in the housing in which the power connectors for the inductive sensor and for an external electrical device are installed. ! 2. The device for monitoring vehicle loading according to claim 1, characterized in that the inductive displacement sensor is made in a cylindrical body in the form of a high-frequency transformer made of a dielectric non-magnetic material wound on a tube along its entire length of the primary winding, over which two are wound at different ends of the tube secondary windings, the rod is made of dielectric non-magnetic material with the possibility of longitudinal movement in the tube and contains a metal core, the primary electrical circuit is made in as a master oscillator, the output of which through an amplifier is connected to the primary winding of a high-frequency transformer, the outputs of two secondary windings of a high-frequency transformer, respectively, are separately connected through two detectors and two integrators to an adder, the output of which is connected to the input of the current amplifier through a voltage divider, and its output is connected to the connector external electrical device. ! 3. The device for monitoring vehicle loading according to claim 1, characterized in that the external electrical device is made in the form of a microprocessor, the output of which is connected to the input

Description

The technical solution relates to weighing devices and is intended to measure and indicate the state of the vehicle loading. It can be used in the transport industry for the operational control of vehicle loading.

It is known "Device for weighing cargo in a dump truck" according to USSR author's certificate No. 584192 dated 12/15/1977, IPC G01G 19/08 - [1], containing pressure sensors with electrical transducers that measure the pressure in the hydraulic cylinder of the lifting mechanism of the dump truck platform, with electrical outputs converters are connected to the adder (integrator) and then to the external electrical unit for loading the dump truck.

The disadvantage of the device [1] is the possibility of its use almost exclusively for dump trucks with hydraulic lifting of the cargo platform, but the use of the proposed technical solution for other vehicles without hydraulic lifting of the cargo platform is impossible. In addition, the device is complex in design and requires a significant change in the hydraulic system of the lifting mechanism of the platform of the truck when installing the device [1].

It is known "Transport weighing device" according to the patent of the Russian Federation No. 2046300 of 10.20.1995, IPC G01G 19/12 - [2], containing strain gauges installed in the tires of the vehicle, pressure sensors, the sensitive elements of which are connected to the internal cavities of the tires, and strain gauge and pressure sensors are connected to the output of the generator and the input of the multichannel amplifier, and the multichannel amplifier, the analog code converter and the external electrical loading control unit are connected to each other in series.

The disadvantage of the device [2] is its complexity and low reliability of information depending on many secondary random factors received from sensors installed in the tires of the car.

It is known "Device for measuring and indicating the loading state of a truck tractor" according to the patent of the Russian Federation No. 2116207 dated 07/27/1998, IPC ВРР 5/00, G01G 19/10 - [3], which contains a measuring body in the form of an elastic element located on the truck - a hitch of a wheeled tractor for connecting with a saddle trailer between a sliding plate and a plate of a fifth wheel hitch of a wheeled tractor in the area of a kingpin of a saddle trailer, the elastic element can be made in the form of a displacement sensor (path), and on at least one axis tractor and / or a saddle trailer having a pneumatic suspension system with right and left elastic elements, at least one other pressure or force sensor is located, pneumatically connected to the discharge cavities of the elastic elements, the pressure sensors being connected to an electric indicator device.

The disadvantage of the device [3] is that it is applicable only to tractor units and its use for another type of car is difficult. Additionally, the disadvantages of the device [3] are the complexity and difficulty of analyzing readings from several disparate sensors (due to the low reliability of the information).

The prototype of the proposed technical solution is "Device for monitoring the loading of a dump truck" according to the patent of the Russian Federation No. 1619059 of 01/07/1991, IPC G01G 19/08 - [4], containing a load sensing unit in the form of a displacement sensor located between the frame and the rear axle of the vehicle, connected to external electrical device. The device further comprises a body position sensor, a motion start sensor, and the external electrical device comprises an encoder, a threshold unit, a register of initial and actual load, a switch, an adder, the output of which is connected to the input of the display unit, and the output of the displacement sensor is connected to the input of the encoder, the first output which is connected to the input of the threshold unit, the output of which is connected to the control input of the switch, the switching inputs of which are connected respectively to the outputs of the sensors of the beginning of movement and body, the first and second outputs of the switch are connected respectively to the first registers of the actual and initial load, the second inputs of which are connected to the second output of the encoder, and the outputs of the registers of the actual and initial load are connected respectively to the first and second input of the adder.

The disadvantages of the prototype [4] the following:

- the relative complexity of the device due to additional sensors of the position of the body and the beginning of the movement;

- the need for processing information immediately from three different and disparate sensors, which reduces the reliability of the information received and significantly increases its cost;

- finding the dump truck loading indication unit on the vehicle itself does not meet modern tasks of remote monitoring of the vehicle loading and location.

These shortcomings set the task of creating a simple, reliable and cheap device for monitoring vehicle loading, which can be installed on any truck and allow it to be quickly and remotely monitored.

These tasks are solved by the fact that in the device for monitoring the loading of the vehicle, comprising a weighing unit in the form of a displacement sensor located between the frame and the rear axle of the vehicle, connected to an external electrical device, the displacement sensor is made inductive with an internal rod and with a primary electrical circuit for signal output, a sensor displacement is placed in the housing in which the power connectors for the inductive sensor and for an external electrical device are installed. Moreover, the inductive displacement sensor is made in a cylindrical body in the form of a high-frequency transformer made of a primary winding that is wound on a tube of dielectric non-magnetic material over its entire length, two secondary windings are wound at different ends of the tube, the rod is made of dielectric non-magnetic material with the possibility of longitudinal movement in the tube and contains a metal core, the primary electrical circuit is made in the form of a master oscillator, the output of which is connected through an amplifier with the primary winding of the high-frequency transformer, the outputs of the two secondary windings of the high-frequency transformer respectively separately through two detectors and two integrators are connected to the adder, the output of which is connected to the input of the current amplifier through a voltage divider, and its output is connected to the connector of an external electrical device. The external electrical device is made in the form of a microprocessor, the output of which is connected to the input of the GSM transmitter of the vehicle’s remote monitoring system for loading the car.

In addition, it is known the location of the "Displacement Sensor" according to Japanese patent No. 3451683 B2 dated September 29, 2003, IPC G01B 7/00 - [5] between the body and wheel of the car, to measure the magnitude of their relative displacement, depending on the load of the car.

However, the known displacement sensor [5], made resistive, containing a movable contact, sliding on the surface of the resistor, which greatly reduces its reliability, especially in off-road and bad weather conditions.

According to the second paragraph of the formula of the claimed technical solution, it is known to perform “Schemes with a linearly adjustable differential transformer LVDT as a displacement sensor or a force sensor and a method for using such a scheme” according to German patent No. 10313021 B3 dated 02.09.2004, IPC G01B 7/02 - [6] , with one primary winding and two secondary windings, the outputs of which through respectively two integrators are connected to the adder, the output of which is connected to the connector of an external electrical device.

However, the well-known analogue [6] and the claimed technical solution have significant differences. So, in the analogue [6] from the master oscillator, “triangular” signals (pulses) with adjustable leading and trailing edges are supplied to the primary winding, and in the claimed technical solution, short “rectangular” signals (pulses) are fed to the primary winding from the master oscillator, which in two secondary windings induce damped shock excitation signals at the natural resonance frequencies of these windings. Also, in the claimed technical solution, the signals coming from two secondary windings are additionally detected before amplification, and this together can significantly reduce or eliminate the influence of phase parameters, reduce the requirements for the geometric characteristics of the windings themselves and increase the sensitivity of the device as a whole. In addition, in the claimed technical solution, the primary electrical circuit is simplified, since two operational amplifiers are used instead of 4–5 according to the well-known analogue [6].

Additionally also known:

- "A linearly variable displacement sensor ..." according to UK patent No. 2405208 A1 of 02.23.2005, IPC G01B 7/00, G01D 5/20 - [7], with a metal core axially movable inside the housing with a cylindrical primary winding over which are wound two secondary windings.

- "The method and device for determining the position ..." according to US patent No. 6541961 VA dated 01.04.2003, IPC G01B 7/00 - [8], according to which the signal from the inductive linear displacement sensor is sent for processing to a microprocessor device (computer).

- “Non-contact sensor” according to European patent No. 1580532 A1 of 09.28.2005, IPC G01D 5/12 - [9], the housing of which contains a plug connector, electrically connecting the sensor and an external electrical device.

However, the above methods and devices [7], [8] and [9] together (in aggregate) are not used in the form of a displacement sensor (in a weight-sensing unit) of a device for monitoring vehicle loading. In other words, the methods and devices [7], [8] and [9] do not solve the problem of creating a simple, reliable and cheap device for monitoring vehicle loading, which can be installed on any truck and allow its control to be carried out quickly and remotely.

Figure 1 shows a device for controlling the loading of a car - in a section (side view); figure 2 - device for controlling vehicle loading - front view; figure 3 is an external view of a device for controlling vehicle loading; figure 4 - inductive displacement sensor disassembled; figure 5 is a block diagram of a device for monitoring vehicle loading (with a primary electrical circuit for signal output); 6 is a primary electrical circuit for signal output; Fig.7 is a device for monitoring the loading of a car with an external electrical device and a GSM transmitter system for remote control of loading a car.

A device for monitoring the loading of a vehicle, comprises a weighing unit in the form of an inductive displacement sensor 3 located between the frame 1 and the rear axle 2 of the vehicle with a rod 4 of dielectric material. The inductive displacement sensor 3 consists of a hollow cylindrical body, in which a primary electrical circuit for signal output 5, a connector 6, and a tube 7 made of dielectric non-magnetic material axially located along the central axis of the cylindrical body 3 are installed with the primary winding 8 wound along its entire length, over which at the different ends of the tube 7 two secondary windings 9 and 10 are wound. Inside the tube 7, a rod 4 with a metal core 11 is mounted with the possibility of movement. The primary electrical circuit for signal 5 made in the form of a master oscillator 12, the output of which through the amplifier 13 is connected to the primary winding 8 of the high-frequency transformer 14, the outputs of the two secondary windings 9 and 10 of the high-frequency transformer 14, respectively, separately through two detectors 15 and 16 and two integrators 17 and 18 are connected to the adder 19, the output of which through the voltage divider 20 is connected to the input of the current amplifier 21, and its output is connected to the connector of an external electrical device 6. An inductive displacement sensor 3 is attached to the frame 1 and the rear axle 2 of the car mechanical bonds with two degrees of freedom. An external electrical device is made in the form of a microprocessor, the output of which, according to the results of current discrete calculations, is connected to the GSM input of a transmitter for remote control of the vehicle’s loading and its location.

A device for monitoring the loading of a vehicle works as follows: when loading and unloading a vehicle, its frame 1 is shifted relative to the rear axle 2, and sensor 3 converts these linear movements into output voltage. The vehicle load is measured indirectly in accordance with the linear movement of the rod 4 with the metal core 11 of the sensor 3. The primary electrical circuit for signal 5 is supplied from the vehicle's on-board network, also through connector 6. A constant voltage is present at the output of the sensor (at connector 6), depending from the movement of the rod in the range from 0 to 5 V. The primary winding 8, the secondary windings 9 and 10, as well as the metal core 11 on the rod 4 form a high-frequency transformer 14. In the primary circuit signal 5, the master oscillator 12 through the amplifier 13 excites a pulsed current in the primary winding 8 (wound on a tube 7 of a dielectric non-magnetic material) and causes shock excitation in the secondary windings 9 and 10 at the frequencies of its own resonance. The alternating voltage of the secondary windings is detected respectively in the detectors 15 and 16 and through the integrators 17 and 18 is fed to the inputs of the adder 19. From the output of the adder 19, through a voltage divider 20, a signal proportional to the voltage difference at its input is fed to the input of the current amplifier 21. Next the signal from the current amplifier 21 through connector 6 is fed to an external electrical device - a microprocessor connected to the GSM input of the transmitter of the vehicle’s remote monitoring system for loading the car.

When developing the design of the inductive displacement sensor, presented in figure 3 and figure 4, standard products are used to the maximum. Overall dimensions of the cylindrical body of the sensor 50 × 289 mm. The mass of the inductive displacement sensor, taking into account the components of the mounting components: 1.2 kg.

Among the advantages of the proposed device for monitoring vehicle loading in the form of an inductive displacement sensor with a primary electrical circuit, one can note its insensitivity to pollution - dust, oil, etc., and harmful environmental factors - humidity, corrosion, that is, its uncriticality to external influences . The device is non-contact: in the design of the inductive sensor there is a significant physical gap separating the electrical and mechanical parts from each other, which reduces wear and increases reliability. The device has the possibility of wide integration (installation) on various types of trucks, has the simplicity of design, and, therefore, its high reliability, and also has high reliability and accuracy of the information issued. Additionally, it is possible to note the low cost of the device and the ability to use it to remotely control the vehicle load.

We believe that the proposed device has all the criteria of the invention, since:

- A device for monitoring vehicle loading in conjunction with the restrictive and distinctive features of the claims is new to well-known devices and, therefore, meets the criterion of "novelty";

- the totality of the features of the claims of the invention of the device is not known at this level of technology and does not follow well-known rules for the design of devices for controlling vehicle loading, which proves compliance with the criterion of "inventive step";

- the constructive implementation of the device for monitoring vehicle loading does not present any structural, technical and technological difficulties, which implies compliance with the criterion of "industrial applicability".

Literature:

1. USSR author's certificate No. 584192 dated 12/15/1977, IPC G01G 19/08, "Device for weighing cargo in a dump truck."

2. RF patent No. 2046300 of 10.20.1995, IPC G01G 19/12, "Transport weighing device."

3. RF patent No. 2116207 of 07.27.1998, IPC ВРР 5/00, G01G 19/10, "Device for measuring and indicating the load state of a truck tractor."

4. RF patent No. 1619059 dated 01/07/1991, IPC G01G 19/08, “Device for controlling the loading of a dump truck” - prototype.

5. Japan Patent No. 3451683 B2 dated September 29, 2003, IPC G01B 7/00, “Displacement Sensor”.

6. German patent No. 10313021 B3 dated 02.09.2004, IPC G01B 7/02, “Scheme with linearly adjustable differential transformer LVDT as a displacement sensor or force sensor and how to use such a scheme”.

7. UK patent No. 2405208 A1 of 23.02.2005, IPC G01B 7/00, G01D 5/20, "Sensor linearly variable displacement ..."

8. US patent No. 6541961 VA dated 04/01/2003, IPC G01B 7/00, "Method and device for determining the position ...".

9. European patent No. 1580532 A1 of 09.28.2005, IPC G01D 5/12, "Contactless sensor."

Claims (3)

1. Device for monitoring vehicle loading, comprising a weighing unit in the form of a displacement sensor located between the frame and the rear axle of the vehicle, connected to an external electrical device, characterized in that the displacement sensor is inductive with an internal rod and with a primary electrical circuit for signal output, the sensor is placed in the housing in which the power connectors for the inductive sensor and for an external electrical device are installed. 2. The device for monitoring vehicle loading according to claim 1, characterized in that the inductive displacement sensor is made in a cylindrical body in the form of a high-frequency transformer made of a dielectric non-magnetic material wound on a tube along its entire length of the primary winding, over which two are wound at different ends of the tube secondary windings, the rod is made of dielectric non-magnetic material with the possibility of longitudinal movement in the tube and contains a metal core, the primary electrical circuit is made in as a master oscillator, the output of which through an amplifier is connected to the primary winding of a high-frequency transformer, the outputs of two secondary windings of a high-frequency transformer, respectively, are separately connected through two detectors and two integrators to an adder, the output of which is connected to the input of the current amplifier through a voltage divider, and its output is connected to the connector external electrical device. 3. The device for monitoring vehicle loading according to claim 1, characterized in that the external electrical device is in the form of a microprocessor, the output of which is connected to the GSM input of the transmitter of the vehicle’s remote monitoring system for loading the vehicle.