CN2653465Y

CN2653465Y - Dynamic weighing system

Info

Publication number: CN2653465Y
Application number: CN 02287777
Authority: CN
Inventors: 魏鲁原
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-11-29
Filing date: 2002-11-29
Publication date: 2004-11-03
Anticipated expiration: 2012-11-29

Abstract

The main function of a dynamic weighing system is to measure the stress of the tyres of a dynamic vehicle and calculate the weight of the correspondingly static vehicle. The system is used at particular place and time in measuring the stress of the tyres of a dynamic vehicle, calculating the axle weight of the vehicle, distinguishing correctly relative parameters such as number of axles and tyres as well as running speed, all of which are disposed, showed, printed and stored, so as to realize the fully automated and dynamic calculation. Compared with the static weighing system, the dynamic weighing system is able to obtain higher efficiency of detection and save a great deal of manual cost. A group of weighing transducers and acceleration transducers are arranged in a weigh board, and the measured values are respectively collected to a microcomputer. The measured value of the acceleration transducer is a vibrating signal, and the measured value of the weighing transducer detracts the measured value of the acceleration transducer to a stable value, which can be disposed by the specific methods of data processing to an accurately static weight. The block diagram of the hardware configuration of the system can be seen the attached drawing of the abstract.

Description

Dynamic weighing system

Affiliated technical field

The utility model relates to the dynamic vehicle tire force that a kind of measurement is travelled, thereby and calculates corresponding static vehicle weight and realize automatically, not stopping metering outfit.

Background technology

In order to safeguard national wealth and people's life safety, the protection highway is intact unimpeded, and strict restriction over-limited transport vehicle is extremely urgent, imperative.Dynamic weighing system is the desirable equipment of traffic administration, simultaneously, it can be widely used in automatic traffic study, Fare Collection System, traffic safety management, produce the huge social economic benefit, and can be applied to the monitoring and the management of goods carrying vehicles such as industrial and mining enterprises, customs, harbour, harbour, waste material station.The dynamic weighing system application surface is very wide, domestic and international research department and enterprise all development and production go out corresponding product, the domestic dynamic vehicle weighing system of developing, the heavy error of its axle is scholar 5%-10%, can not meet the demands in some occasion.Therefore press for the higher dynamic weighing system of development and production measuring accuracy.

Summary of the invention

The major function of this dynamic weighing system is to measure the dynamic vehicle tire force that travels, and calculate corresponding static vehicle weight, it mainly is made of sensor, data acquisition system (DAS), microprocessor system and LCD, printer etc., be used for measuring in the locality, the tire force of special time driving vehicle, the axle that calculates vehicle is heavy, the correct decision number of axle, tire number, travel speed etc. have related parameter, and handle, show, print and store these information, thereby realize automatically, not stopping metering.System compares with static weighing, and dynamic weighing system can obtain higher detection efficient, and can save a large amount of labour costs.Our device of development is a kind of movably weighing system, be used for low vehicle speeds (＜obtain vehicle axletree load and gross weight 15km/h) time.

The technical scheme that its technical matters that solves the utility model adopts is: place one group of LOAD CELLS and one group of acceleration transducer in weighing plate, collect their measured value in the microcomputer respectively, the measured value of acceleration transducer is a vibration signal, the measured value that the measured value of LOAD CELLS deducts acceleration transducer is a relatively stable value, this value is handled, can be obtained an accurate static weight.

The method of data processing is:

To sampled value a1, a2 ..., an sorts, and removes n/4 less sampled value and n/4 less sampled value.Keep n/2 sampled value, be made as b1, b2 ... bm (m=n/2).

Ask b1, b2 ... the mean value of bm is made as b.

Ask b1-b=c1, b2-b=c2 ..., bm-b=cm, to c1, c2 ..., cm sorts.

C1, c2 ..., find among the cm n/4 smaller value c1 ', c2 ' ..., cp ' (p=n/4), find again with c1 ', c2 ' ..., cp ' correspondence b1 ', b2 ' ..., bp '.

Ask b1 ', b2 ' ..., bp ' mean value, be made as b ', be desired value.

The beneficial effects of the utility model are, it can be loaded and gross weight with fast speeds measuring vehicle axletree, and in dynamic weighing, can not be subjected to the influence of vehicle, not be used in each time and in the measuring process each vehicle is carried out analyzing and processing, thus more accurately easy.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a system hardware structure block diagram of the present utility model.

Fig. 2 is that signal amplifies and biasing circuit figure

Fig. 3 is the load cell signal curve map.

Fig. 4 is the acceleration transducer signals curve map.

Fig. 5 is the signature tune line chart after handling

Embodiment

The system hardware structure block diagram as shown in Figure 1, pressure transducer, acceleration transducer, signal amplification and biasing circuit, A/D converter constitute forward path, LCD display, printer, keyboard, calculation mechanism become interactive system, and storage area comprises program storage, data-carrier store, supplementary proceedings storer.Digital circuit mainly comprises main frame 80C31, program storage 27C256, data-carrier store 6264, supplementary proceedings storer DS1230, A/D converter ADS7832, analog switch 4051, RS-232C level translator chip MAX238 and LCD interface circuit and keyboard interface circuit.

When automobile passes through weighing plate, LOAD CELLS and acceleration transducer respectively gravimetric value and vibratory output are converted to analog electrical signal, deliver to the analog input end of A/D converter again by amplifier, digital quantity after the conversion is handled, result delivered on the LCD as dynamic weighing weight show, simultaneously data are sent on the printer and printed, also data can be sent into by analog switch and RS-232C level translator and stored in the computing machine or further handle.

Signal amplification and biasing circuit are as shown in Figure 2; because the electric signal that sensor comes out is a negative value; at first with this signal by phase inverter become on the occasion of; amplify the analog input end of sending into A/D converter with biasing circuit through signal again; change the zero point and the linearity of signal by the resistance of adjusting variohm; add two diodes at analog input end to receive respectively+5V and-5V, make the absolute value of the signal of sending into A/D converter be not more than 5.5V, the protection A/D converter be not damaged.

When automobile passes through weighing plate with certain speed, tire is 0.1s by the time of weighing plate, 200 points of LOAD CELLS sampling during this period of time, can obtain sampled value (v) with the relation curve of time (t), as shown in Figure 3, acceleration transducer 200 points of also sampling, can obtain the relation curve of sampled value (a) and time (t), as shown in Figure 4, the measured value of LOAD CELLS deducts signature tune line chart such as Fig. 5 that acceleration transducer obtains, this is a metastable signal, and this value is handled, can a proper accurate static weight.

In addition, to carry out tonnage correction and speed correction by the value of weighing that above algorithm is obtained, eliminate sensor non-linear with automobile by the different influences that bring of speed.

Claims

A kind of dynamic weighing system, it is characterized in that: in weighing plate, place one group of LOAD CELLS and one group of acceleration transducer, collect their measured value in the computing machine respectively, the measured value of acceleration transducer is a vibration signal, the measured value that the measured value of LOAD CELLS deducts acceleration transducer is a stationary value, this value is handled, can be obtained an accurate static weight.