CN1031222C - Method of compensating load position for lultiple load cell scale - Google Patents
Method of compensating load position for lultiple load cell scale Download PDFInfo
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- CN1031222C CN1031222C CN 91110777 CN91110777A CN1031222C CN 1031222 C CN1031222 C CN 1031222C CN 91110777 CN91110777 CN 91110777 CN 91110777 A CN91110777 A CN 91110777A CN 1031222 C CN1031222 C CN 1031222C
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Abstract
Multiple digital load cells forming one or more weighing scales are connected together and to a common master controller in a local area network. The digital load cells are polled by and provide weight readings to the master controller. The weight readings are combined with a load position correction factor for each load cell and summed to provide a weight indication corrected for load position. The values of the load position correction factors are determined during set up of the scale and stored at the master controller. An individual load cell can be diagnosed remotely and replaced if defective. A new load position correction factor is determined and stored for a replacement load cell.
Description
The present invention relates to multiple load cell scale, relate more specifically to the compensation method of the load position of a plurality of load cell scales.
Many occasions of weighing need be used a plurality of dynamometers in single scale or in several related scales.For example, be used to claim a plurality of dynamometers of big carrying capacity scale needs of truck or rolling stock weight.Each dynamometer provides the simulating signal that is proportional to that part of load of being born by this dynamometer.The straingauge that is connected in the resistance bridge structure provides this simulating signal usually.In big carrying capacity application scenario, load is distributed on four dynamometers usually at least, and in some application scenario, may need 16 or more dynamometer.Must obtain the sum total of each dynamometer output signal, so that the signal of expression total load to be provided.Be used for to be that each output terminal is connected in parallel from each usual method of simulating the signal plus of dynamometer always, be added to the single simulation output signal of the general assembly (TW) on this scale so that expression to be provided.
The weighing precision of multiple load cell scale not only depends on the precision of single dynamometer, and, depend on machinery between them with the influencing each other of electricity.Because each dynamometer has different sensitivity to added load usually, so the total output signal of scale depends on the position of weight on this scale usually.Therefore, must compensate or adjust the output signal of each single dynamometer, so that for giving constant load, no matter this load places where going up of scale, it is identical that the total output signal of scale keeps basically.The method that is generally used for finishing this load position compensation is always: connect sensitivity reduction resistance in the Wheatstone bridge circuit of single dynamometer, be connected across the output terminal of bridge diagram usually.The United States Patent (USP) 4,261,195 of Lockerry, the United States Patent (USP) 4,574,899 of Griffen and the United States Patent (USP) 4,556,115 of Lockery have been discussed the problem of load position compensation in many Load cell scales.
Although proposed to solve the method for load position problem in the above-mentioned patent,, wherein still exist and intend the problem that dynamometer is connected in parallel and interrelates with multimode.Each dynamometer is interactional when being electrically connected to each other, and therefore, the performance of the dynamometer during routine tests will be different from scale the performance when testing with other dynamometers.The interaction of each dynamometer that links together makes by resistance being connected to the problem of carrying out the load position compensation on the single dynamometer complicated greatly.In order to obtain the suitable compensation resistance value, may need a large amount of iteration or circulation, this be because: when compensating resistance being connected on other dynamometers, must adjust initial resistance value that determine, that be suitable for specific dynamometer.The adjustment of this resistance value may require to adjust other compensating resistance again, by that analogy.
When the mimic channel of each dynamometer was linked together, they can not be monitored in essence individually.Therefore, the trouble hunting of scale or repairing may need each circuit is taken apart, so that test each dynamometer individually, thereby find out the dynamometer of damage.In addition, when because any former thereby when replacing a dynamometer, this scale need carry out the load position compensation usually again.For finishing this compensation again, need the test weight of known weight.For big carrying capacity scale, this is especially time-consuming process, and, usually be not easy to obtain the test weight of known weight.
Recently, what is called " digital force gauge " occurs, wherein, A/D converter and microprocessor have been used for single dynamometer.Electronic circuit is installed on the printed circuit board (PCB) that the thrust component that is directly connected in dynamometer states.Adopted various digital technologies compensated single dynamometer temperature, creep and linear error.
General purpose of the present invention is to eliminate in essence and the problems referred to above that the simulation electric part of a plurality of dynamometers is linked together and interrelates.More specifically saying so to provide the load position compensation in the multiple load cell scale and the method for other error compensations.
Multiple load cell scale is carried out the method for load position compensation according to the present invention, the device that provides each dynamometer to load digital expression is provided described scale, this method may further comprise the steps: determine that (this formula comprises the correction factor of at least one described dynamometer for load mathematic(al) representation through the load position correction, store described mathematic(al) representation, inquire each in the described dynamometer, represent to receive described digital load, described mathematic(al) representation is added to described digital load represents, to produce digital expression through this scale total load of load position correction.This method also comprises determines load position correction factor, the step of storing this factor.The load position correction factor is combined with the expression of corresponding digital formula load, the revised digital load of generation is represented.Uncorrected digital expression is combined and just produces the digital expression of this scale through the total load of load position correction with revising the digital load in back.The method of determining described correction factor is: load is placed on the variant position of scale, determines the response of each dynamometer to load and position; And, utilize described response to determine modified value.
The connection of the dynamometer of digital weight readings is provided, has eliminated the problem that runs into when the simulation electric part of each dynamometer linked together.Because each dynamometer does not influence each other, so, can finish the load position compensation with process single rather than iteration.In addition, do not need the test weight of known weight can finish described compensation yet.
Data can obtain from independent dynamometer, therefore, in case of necessity, can not need to take apart and reconnect under the situation of whole scale or multiple load cell assembly diagnosis and change each dynamometer.Employing is connected to the method for master controller to computing machine via telephone wire and modulator-demodular unit, can handle this diagnosis from afar.In addition, when changing one or more (until all dynamometers except) dynamometer, can newly carry out the load position compensation to this weighing by the dynamometer of only compensation replacing and under the situation of the weight that does not need known weight.
Fig. 1 is the block scheme of enforcement multiple digital dynamometer of the present invention system;
Fig. 2 is the front elevation that is suitable for the digital dynamometer of the embodiment of the invention;
Fig. 3 is the top plan view of the digital dynamometer of Fig. 2;
Fig. 4 is the block scheme of the digital dynamometer electronic circuit of Fig. 2 and 3;
Fig. 5 is a planimetric map of implementing track scale of the present invention;
Fig. 6 is the synoptic diagram of connection of critical piece of the track scale of key diagram 5;
Fig. 7 is the block scheme of optimised form of master controller that is used for the scale of Fig. 5 and 6;
Fig. 8 A to 8M is the flow chart of the operation of each digital dynamometer among explanation the present invention;
Fig. 9 A and 9B are the flow charts that explanation is used for the linear compensation process of digital dynamometer;
Figure 10 A to 10L is the flow chart of operation of the master controller of key diagram 7;
Figure 11 be explanation in the flow chart of Figure 10 A to 10L, be used for determining the flow chart of process of the load position correction constant value of digital dynamometer;
Figure 12 A and 12B are the flow charts of process of dynamometer that explanation is used for the address is given the replacement of multiple load cell system; And
Figure 13 be explanation in Figure 10 A to 10L, be used for the flow chart of process of the load position correction constant of dynamometer that determine to replace.
Below with reference to Fig. 1, implement system of the present invention, that have a plurality of dynamometers and comprise some groups of digital force gauge 20, indicate with label 11 to 14 shown in the figure four groups.Dynamometer 20 in 11 to 14 each group links together with multiwire bus 30 by means of terminal box 22,23,24 and 25.This bus also links together each terminal box, and, they are connected to master controller.Show among the figure, 11 to 14 each the group comprise three dynamometers 20, still, they can comprise from one to a large amount of dynamometers, this depends on specific application scenario.Terminal box 22 to 25 is as the lead termination point, and a terminal box can have the dynamometer of any number, and this is easily in specific application scenario.If necessary, each terminal box also can contain public A/D converter and analog switch, and allowing shared these parts, rather than each dynamometer has special-purpose A/D converter.11 to 14 4 groups of dynamometers shown in the figure, still, as indicated in the dotted portion of bus 30, in specific application scenario, the number of employed dynamometer group can be more or few.
Each digital dynamometer 20 is connected with each other via bus 30, and, be connected to master controller, transport to LAN (that is, local area network) provides the foundation, in this network, between independent dynamometer 20 and master controller 34, can communicate by letter.Another kind method is each digital force gauge 20 or terminal box 22-25 can be connected to master controller 34 separately.But described LAN is desirable.
In LAN, master controller 34 plays master, and can not cause and the communicating by letter of master controller as each independent dynamometer of slave unit.LAN preferably adopts Intel BITBUS communication system.Each dynamometer 20 (slave unit) of master controller 34 polls, perhaps, Xuan Ding each dynamometer on request.Each dynamometer is according to the transmission data of coming autonomous controller or require information and reply.
In the scheme of Fig. 1, have 11 to 14 each group of one or more digital force gauge, can constitute independent scale, therefore, the corresponding weight data that the array output signal indication of all dynamometers is collected and handled by master controller 34 in this group.An example of this application scenario is to distribute every group of dynamometer to claim specific, as to contain a many chargings or discharging tank or a basin.At that time, can monitor and control the quantity and the state of the material that transports by each tank or basin via master controller 34.In another kind of application scenario, all dynamometers 20 may be in same scale in 22 to 25 each group, for example, is distributed in track scale or other and uses under the platform of title of weighing platforms on each selected position.
Under the situation of a platform balance, all dynamometers of master controller 34 periodic pollings, and weight data added up, to draw the weight of object on the platform.Under the situation of many platform balances, when tank or basin charging or discharging, when perhaps regularly checking in tank or the basin surplus material, described system once only handles a platform balance.Master controller 34 only just needs each dynamometer of the specific scale of poll when obtaining asking.
As shown in Fig. 2 and 3, each digital dynamometer 20 comprises total thrust component of 50 that is designated as, and with mechanical means printed circuit board (PCB) 52 is fixed on this thrust component.The electronic circuit that is installed on the plate 52 makes each dynamometer offer master controller 34 to weight information with digital form.Illustrated thrust component 50 is called " rocking bar ", and this thrust component is desirable in a plurality of digital dynamometers application scenario, and, have some advantage.But, can use any type of thrust component in essence.The electric transducer that occurs with the form of straingauge 54 to 57 is installed on the thrust component 50 in common mode, and, be connected in the bridge diagram, so that being provided, expression is added in the simulating signal of the load on the thrust component 50.Also can use with shown in rocking bar combine, perhaps, the other forms of transducer that combines with other forms of thrust component that those skilled in the art are understood.Nickel resistance 59 also is installed on the thrust component 50, and be used for detected temperatures and change, thereby, realize compensation to this temperature variation effects.By suitable wiring (not shown) straingauge 54 to 57 and nickel resistance 59 are connected on the Circuits System that is installed on the plate 52.
As shown in Figure 4, allergic effect resistor disc 54 to 57 is connected in the bridge diagram 60, and the latter provides weight signal for prime amplifier 63.Be coupled to an input end of analog switch 68 via analog filter 65 from the weight signal of prime amplifier 63.The output terminal of analog switch 68 is connected to the input end of many gradients A/D converter 70.Nickel resistance 59 is connected with bridge diagram 60, and, provide signal via prime amplifier 75 for another input end of analog switch 68.With power supply 77 excitation electric bridges 60, this power supply also provides known reference voltage via analog switch 68 for many gradients A/D converter 70.The output terminal of A/D converter 70 is connected to microprocessor 80, and the latter is Intel 8344 preferably.The action of microprocessor 80 control analog switches 68 makes from the weight signal of electric bridge 60 with from the temperature indication signal of nickel resistance 59 and is transformed into digital form via A/D converter 70, then, is transported to microprocessor 80.
Program in the digital force gauge illustrated among Fig. 2,3 and 4 each, so as they each work as the slave unit of described master controller, and, response is made in the instruction that is transported on these dynamometers.The exclusive address of each dynamometer is stored in the storer of this machine, and the latter only allows master controller that instruction is delivered in this storer.In the manufacture process, all dynamometers have identical address, and this address is replaced by exclusive address when adjusting scale.
In addition, program for each digital force gauge, so that with regard to the influence aspect of temperature to starting point and adjacent scale interval, adjacent scale interval adjustment aspect, the linear and aspect of creeping compensates its weight readings.The backoff algorithm that is adopted (comprising some constant values) is stored in the dynamometer storer.During making dynamometer, determine these constant values.The method of determining these constants is: during the manufacturing, dynamometer is connected on the principal computer, makes this dynamometer bear desired, various weight and temperature conditions, to be provided for the data in the correction algorithm, and, utilize these data to obtain each corresponding constant.Then, these constants are transported to this dynamometer by means of principal computer, and, be stored in the storer.
With reference to figure 5 and 6, the general application system of a kind of Fig. 1 of being similar to shown in the figure but be combined into the system of the separate unit scale that is used for vehicle weighing.This system comprises 8 above-mentioned digital force gauge 20, and they support a platform 125 that is suitable for vehicle (for example truck).Each dynamometer 20 links together via terminal box 127, and, be connected to master controller 130 via bus 128.This master controller can connect one or more peripherals 132, for example printer or principal computer.Arrange each digital dynamometer 20 and master controller 130, and, for they program, make them constitute LAN, wherein, master controller 130 is as the master operation, and each dynamometer 20 moves as slave unit.With the same in Fig. 1 system, this LAN preferably uses the IntelBITBUS communication system.
As shown in Figure 7, master controller 130 comprises the microprocessor 140 (preferably Intel 8344) that has internal RAM storer 140a and serial interface unit 140b.Microprocessor 140 is via the driver 142 and the receiver 143 that are connected to serial connection mouthful unit 140b, is connected to be used for the bus 128 of communicating by letter with each digital force gauge 20.Microprocessor 140 also keeps communicating by letter with address/data bus 150, program storage 152, and RAM153, real-time clock 154 and a pair of double-purpose transmitter 156,157 are connected to bus 150. Transmitter 156 and 157 is connected to bus 150 on the various peripherals, for example, and printer 160, principal computer 161, bar code scrambler 163 and serial input/output line 164.Parallel output line 166 also is connected to bus 150 via latch 167.
Master controller shown in Fig. 7 is the assignee by the application, 8530 type digital display devices of ToledoScale Corporation produce and market.
In service in the system of Fig. 1 or Fig. 5 and 6, as the master controller of LAN master with desired each dynamometer of speed poll (each LAN ancillary equipment, that is, each slave unit), so that receive weight data from each dynamometer.Can handle data in some aspects from each dynamometer, described data and data addition from other dynamometers of this scale, and, further handle resulting result, to produce the weight of final demonstration.Under the situation of the system of many platform balances of Fig. 1, master controller is each dynamometer of the specific scale of poll only, and, to handle the information that receives with above-mentioned identical mode.In every kind of system of separate unit scale and many platform balances, before operation, the every platform balance that is comprised will need calibration and adjust.
Though, resemble that to connect and operate the LAN be desirable,, the digital output signal of each dynamometer (one group of dynamometer of a perhaps shared A/D converter) can be connected to master controller separately, rather than via common bus.The feature of essence is: described master controller receives and handles the digital information from each dynamometer in a plurality of dynamometers.
According to an aspect of the present invention, with the method for digital computation multiple load cell scale is carried out the correction of load position error aspect.In the scale of Fig. 5 and 6, when same weight when the variant time is placed on the same position of platform 125, will be identical from the weight signal of single digital dynamometer 20.But, when weight is placed on positions different on the described platform,, may increase, reduce or keep identical from the digital signal of dynamometer (perhaps they with number) according to the new position of weight.According to the present invention, these digital signals are revised, so that for the diverse location of same weight on the described platform, on the expression platform 125 weight, each signal through revising with keep identical basically.
Can the general assembly (TW) B on the platform 125 be expressed as:
B＝A
1＋A
2＋A
3＋……A
N
Wherein N is the number of the dynamometer of this scale, and Aj is the digital weight readings from single dynamometer.
Can represent general assembly (TW) that proofread and correct through load position, on the platform 125 with following formula:
Bc＝A
1X
1＋A
2X
2＋A
3X
3＋……＋A
NX
N (1)
Wherein, Bc is the general assembly (TW) of proofreading and correct through load position, and Xj is the constant load position correction coefficient of single dynamometer.
When the value of counting Xj when the load position corrective system of each dynamometer is known, just can be stored in them in the master controller 130, duration of work just can utilize them that each dynamometer weight readings is done load position and proofread and correct.
Can when the Installation And Calibration scale, determine the value of the coefficient Xj of each dynamometer.The weight readings that can utilize equation (1) and obtain from each dynamometer under the situation that same weight is placed on variant position on the platform 125 is determined the value of each coefficient.For scale with N dynamometer, same weight is successively placed on the platform 125 on each position in N the position (Fig. 5 and 6), and, in each position, obtain weight readings from each dynamometer.Can utilize resulting data to constitute N and have equation above-mentioned equation (1) form, that N unknown number arranged,, the equation of a correspondence be arranged for each position of weight on the platform 125.In each equation, Aj is described test weight weight readings from N dynamometer when being placed on same position, and Xj is the unknown-value of each invariant system.Can set Bc and equal to test weight of heavy.But,, do not need to know used test weight of heavy according to the present invention.This is an advantage, and is because the test weight of known weight normally is very difficult to obtain, especially for the oversize vehicle scale, all the more so.Under the situation of the unknown test weight of heavy, the Bc that sets each equation in N the equation of the form with equation (1) equals identical numeral.For example, can set Bc in each equation and equal N and the mean value of number from the reading of N dynamometer.
Can obtain the value of N unknowm coefficient in N the equation by many any methods of known method usually that are used for separating simultaneous equations.A kind of desirable method is commonly referred to as: " Gaussian elimination method that does not have exchange ".Narrated this method in many textbooks, for example, " applied linear algebra " (second edition) of S.J.Leon work, McMillanPublishing Company published in 1986.In order to guarantee to be separated accurately, this method requires each dynamometry in respect of a weight position readings, and in this position, this dynamometer has the highest output signal in all N dynamometer.Once can only be placed on basically under the situation on the dynamometer at the test weight, this condition is to satisfy easily.Under normal conditions, many dynamometers are shared a weight, still, in the overwhelming majority in this case, can select each position of known weight,, have a different dynamometer to bear most of load in each dynamometer to guarantee each position for known weight.
In some scale, perhaps can not the test weight be placed on each independent dynamometer or fully near it, to satisfy above-mentioned requirements.For example, in the truck scale, will run into this problem; This scale is only wideer slightly than the truck as weight.In this case, can make dynamometer loading in couples.That is, a pair of dynamometer is regarded as one, and, make this scale loading, so that on each weighing positions, have different a pair of dynamometers to have the highest output signal in each dynamometer.During work,, just can claim to carry out sufficient load position compensation to this as long as the load on this scale is not narrow significantly with respect to platform.
For this scale with N dynamometer, correction equation has following form:
Bc＝(A
1＋A
2)X
1＋(A
3＋A
4)X
2＋(A
5＋A
6)X
3＋……
Wherein, defined the same among the Bc, Xj and Aj and above equation (1).
When not being placed on the appropriate location to the test weight, so that each dynamometer has a weight position readings (in this position, this dynamometer has the highest output signal in all N dynamometer) time, " Gaussian elimination method that does not have exchange " may not provide gratifying and separate.Under the sort of situation, can adopt that some are more convenient, but expend time in and the method for computer memory, for example, matrix method or any other standard method that is used to separate N simultaneous equations with N unknown number.In these methods, still requiring each equation is independently.
Before the scale system operation of Fig. 5 and 6, must carry out system and set up and calibrate.After being installed in each dynamometer on the position suitable under the weighing platform, and each independent dynamometer is connected to before the master controller in the local area network, carries out that above-mentioned system sets up and calibration.Select described system to set up mode via the keyboard of master controller, and, the number of the dynamometer in this scale system imported by this keyboard.Then, since No. 1, give dynamometer with the address successively.Only first dynamometer is connected to bus, and, only No. 1 address is sent to this dynamometer and deposit in this dynamometer storer.Then, second dynamometer in the system is connected to bus, and, give it No. 2 addresses with identical method.This process is carried out continuously, has been connected to bus until all dynamometers, and, be endowed different addresses.So master controller can be communicated by letter with each dynamometer in this local area network, set up work to continue calibration and system.
Another step that described system sets up in the process is the load position correction constant of determining in the above-mentioned equation (1).In this step, will test weight (it can be unknown gravimetric value) and be placed on first dynamometer of scale, then, obtain weight readings and these readings are deposited in the master controller storer from each dynamometer.Then, same weight is placed on second dynamometer, simultaneously, obtains weight readings and store these weight readings.Carry out continuously this step, under the situation of each position that is arranged in N position at same weight, all dynamometers are obtained weight readings till.
By said method, utilize these data to set up and conciliate N equation, to obtain the value of load position correction constant with N unknown number.These constants and equation (1) are stored in the storer of master controller together, are used for when work, weight readings being carried out the load position correction.In some cases, one or more dynamometer output signals may not need the load position correction.Under the sort of situation, revising constant can equal 1 simply, and, will all equate from the revised and uncorrected reading of that or those dynamometer.
Set up during the system, also described system is carried out the calibration of starting point and adjacent scale interval aspect, and, the calibration value that obtains in this process is deposited in the storer of master controller, so that in weighing operation, use.
The flow chart of Fig. 8 A to 8M illustrates the operation of each digital force gauge, these dynamometers or be connected to Fig. 5 and 6 system in, revise constant and be connected in the principal computer in order to calibrate and to calculate during perhaps making.At program block 250 " starting " afterwards, begin operation in program block 251 " quiet " mode.This is a kind of native mode in essence, because master controller or principal computer do not begin to communicate by letter with dynamometer as yet.In program block 252 and 253, obtain the dynamometer address from storer, and, check its validity.If institute's address stored is invalid, so, in program block 255, write and have arbitrary value the address of (for example 1 or 240).Determine that institute's address stored is effectively, or after the new address of giving, operational order carries out forward directly, perhaps,,, check the ROM mistake,, just set mark if find that this mistake is arranged at program block 257 via program block 254 to 257.Then, at program block 259, from the nickel resistance 59 acquisition temperature readings of Fig. 4, and with the usefulness of its storage for compensation.Obtain digital weight readings at program block 260, and, remove the negative mark that goes beyond the scope.At program block 262, check weight readings, to determine whether this reading goes beyond the scope.If this reading does not go beyond the scope, then operational order is proceeded to program block 268 (Fig. 8 B) via point 264, in program block 268, makes about these data and should be compensated, still with the decision of its primitive form appearance.If determine that at program block 262 these weight readings go beyond the scope, so, set marks, and operational order is proceeded to program block 272 (Fig. 8 B) via point 270 at program block 269.Equally, if determine and will weight readings not compensated at program block 268, so, operational order jumps to program block 272 via point 270.
If this weight readings is compensated, so, execution subroutine in program block 275 is so that carry out temperature compensation to starting point and adjacent scale interval coefficient.At program block 276, as hereinafter will illustrating, utilize subroutine " LINCOR " to revise the non-linear of this weight readings.At program block 277 and 278 execution subroutines respectively, adjusting coefficient correction weight readings according to adjacent scale interval, and to the weight readings correction of aspect of carrying out creeping in the dynamometer.
At program block 272,280, in 281 and 282, the examination memory error and the data that go beyond the scope, and, when any this state of discovery, the suitable error code of packing into.Then, operational order enters program block 286 (Fig. 8 c) via point 284, at program block 286, determines whether dynamometer is in quiet mode.If dynamometer is not in quiet mode, so,, weight and temperature reading are packed in the serial buffer at program block 288, so that transmit, and operational order enters program block 290.If dynamometer is in quiet mode, so, walk around program block 288, to program block 290, in program block 290, check any information via point 291 from principal computer or master controller.If there is not information, and, determine that in program block 292 dynamometer is in quiet mode, so, operational order is via the major cycle at point 293 return information pieces 252 places, and the repetition aforesaid operations instructs.If dynamometer is not in quiet mode, so, operation enters program block 295 from program block 292, and, enter circulation via point 296, till serial buffer is empty (this show weight and temperature reading are sent to master controller or principal computer).At that time, operational order is via the major cycle (Fig. 8 A) at point 293 return information pieces 252 places.
When determining to have received information in program block 290, operational order enters program block 300 (Fig. 8 D) via point 298, in program block 300, identifies the validity of described information.If described information is invalid, so, replying of this result is sent to program block 301, and operational order is via point 296 return information pieces 295.If determining described information in program block 300 is effectively, so, operational order enters program block 305 (Fig. 8 E) via point 303, to determine the content of described information.The repositioning information instruction makes operational order return " starting " point 250.If determine that at program block 307 described information are the instructions that are used for trigger data output, so, in program block 308, forbid quiet mode and adopt and now use data mode.Then, operational order 310 proceeds to program block 311 (Fig. 8 M) via point, master controller or principal computer are made replying that described instruction implemented.So described circulation proceeds to program block 295 (Fig. 8 C) via point 296, the transmission data, then, the starting point of return information piece 252 place's operational orders.
If determine that at program block 307 (Fig. 8 E) described information is not the instruction of trigger data output, so, operation 315 proceeds to program block 316 (Fig. 8 F) via point, is about the instruction of primitive form data or about the instruction of compensating form data to determine described information.If so, then in program block 317 mid-director data modes, via point 310 with implemented the program block 311 of this instruction and make and replying, then, operational order is via putting 296 return information pieces 295.
Whether if determining described information in program block 316 is not the data mode instruction, so, operational order carries out a series of inquiries via point 319, be the information of the correction data (for example, algorithm compensation constant) that comprise storer to be deposited to determine described information.In program block 322 (Fig. 8 G), determine whether described information comprises temperature compensation data.If do not comprise, so, operational order 323 carries out following steps in order via point: (1) program block 326 (Fig. 8 H), to determine the described data offset data of whether creeping; (2) 327 and program block 329 (Fig. 8 J), to determine that described data are the linear compensation data; And (3) point 330 and program block 331 (Fig. 8 K), be that adjacent scale interval is adjusted calibration data to determine described data.Comprise the class data in all kinds of offset datas if determine described information, so, operational order proceeds to program block 335 (Fig. 8 G) via point 333, deposits data in storer in this program block.Then, in program block 336, check whether successfully pack into to determine described data.If pack into successfully, so, operational order 310 enters program block 311 via point, to make replying that information command implemented, then, via point 296 to program block 295.If it is unsuccessful that described data are packed into, so, in program block 338, send the replying of this result, and operational order enters program block 295 via point 296.
Only should be pointed out that the adjustment period between (as the part of manufacture process) just be used in temperature, creep, linear and adjacent scale asks every adjusting the penalty constant of revising aspect the calibration and is sent to digital force gauge.Therefore, when dynamometer during, above-mentioned in the information that receives, existing the result of the test of these class data to negate as the scale system of Fig. 5 and 6 a part of.
Again with reference to figure 8A to 8M, after the data constant that comprises in to the information that receives in program block 331 (Fig. 8 K) is checked at last, operational order enters program block 341 (Fig. 8 L) via point 340, whether comprises the address assignment of dynamometer so that determine described information.If do not comprise, then operational order enters program block 295 via point 296.If described information is the address assignment, so, in program block 343, this address is deposited in the storer, and, in program block 344, check whether finish satisfactorily to determine packing into of described address.When packing into of this address is not gratifying, in program block 345, send the replying of this result, and operational order enters program block 295 via point 296.Successfully pack into if determine described address in program block 344, so, operational order proceeds to program block 311 (Fig. 8 M) via point 310, has implemented replying of described instruction so that transmit.Then, operational order enters program block 295 via point 296.
Fig. 9 A and 9B explanation each step that in program block 276 (Fig. 8 B), carry out, that be used for providing the linear subroutine LINCOR that revises to weight readings.350 (Fig. 9 A) locate to enter this subroutine at point, then, enter program block 351, and in this program block, linear compensation constant D and E pack into.Then, operational order enters program block 353, in this program block, checks to determine whether described constant is correctly packed into.If correctly do not packed into, then operational order enters program block 355 (Fig. 9 B) via point 354, in this program block, puts error flag, and then, operational order is via putting 357, returning master routine at program block 277 places.If determine that in program block 353 the linear compensation constant is packed into satisfactorily, so, operational order enters program block 358, in this program block, calculates and store the weight readings through the linearity correction.Then, operational order is via point 357 program blocks 277 that return in the master routine.
According to description above, obviously, for each digital force gauge in Fig. 5 and 6 systems, in case this dynamometer has been endowed the address, and, be converted to the active data mode from quiet mode, then its operation mainly is made of following step: obtain weight and temperature reading; For above-mentioned various factors compensates described weight readings; And the reading after the compensation offers master controller.
The operation of flow chart explanation master controller 130 in the scale of Fig. 5 and 6 of Figure 10 A to 10L.In carrying out program block 400 in energising and the program block 401 after some initialization step, in program block 403 from the memory fetch system number of dynamometer, and, in program block 405, check this information.If do not write the number of dynamometer as yet, so, in program block 406, will select for use the dynamometer sign to set up mode, and operational order will jump to decision block 410 (Figure 10 B) via point 407, with check key disk activity state.If determine that in program block 412 keyboard activity is normal, and this system is in the mode of foundation, so, operational order jumps to decision block 415 via point 413, with the number that determines whether known dynamometer and their address.If unknown, then operational order enters decision block 417, whether indicates the activity of single or whole keys to determine this keyboard.If indication, then operational order jumps to program block 420 and 421 (Figure 10 D) via point 418, there, sends the instruction that suitably shows, and, according to there being one or more dynamometers to be provided with or to remove single dynamometer mark in the system.Then, operational order there, writes the number of dynamometer via point 423 rebound program blocks 425 and 426 (Figure 10 C), and, give them with the address.The method of giving the dynamometer address is: only first dynamometer is connected to bus, gives address digit 240 these dynamometers of visit of all dynamometers during according to manufacturing, and, order this dynamometer the address of this address modification for newly giving.Then, second dynamometer is connected to bus, and, above-mentioned steps repeated.Carry out this step continuously, all be connected to bus until all dynamometers, and, all be endowed till the address.
Operational order enters program block 432 and 433 (Figure 10 E) from program block 426 via point 430, there, sends reset instruction for all dynamometers, succeeded by the instruction that data are provided when polled.If determine in program block 435: the dynamometer that has is not replied energetically, so, in program block 436, show the address of highest serial no response dynamometer, the operator can be intervened where necessary.Then, operational order jumps to program block 425 and 426 (Figure 10 C) via point 423, there, gives the dynamometer address once more, so operational order is via point 430 return information pieces 432433 and 435.Operational order carries out around this circulation, and until make following judgement in decision block 435 till: all dynamometers are all replied energetically in this system.
Operational order enters decision block 442 (Figure 10 F) from decision block 435 via point 440, sets up mode to determine whether this system has logged off.If do not withdraw from, so, operational order jumps to program block 446 (Figure 10 G) via point 445, to begin to check the triggering of one or more keys in a series of keys (they send various systems and set up function command).If detect the key instruction of giving the dynamometer address again at program block 446, so, operational order jumps to below in the process illustrated among Figure 12 A of description and the 12B via point 448.For example, damaged and must change the time, given the thing that the dynamometer address just may necessitate again when a dynamometer in the system that determines Fig. 5 and 6.Under the sort of situation, must give new dynamometer the address identical with the dynamometer that is replaced.
When the process of giving the dynamometer address again finished, operational order returned decision block 442 via point 440 (Figure 10 F), sets up mode to determine whether to log off.If do not withdraw from, operational order is via putting 445 scannings that restart the key instruction.Instruct if received the key of calibration scale in decision block 453 (Figure 10 G), so, operational order jumps to that process via point 455.After finishing calibration operation, operational order returns decision block 442 (Figure 10 F) via point 440, and, restart the key instruction scan via point 445.Operational order is to carry out continuously via decision block 457,459 and 461 this modes.In program block 457, displacement is adjusted the key instruction via (below will be described) illustrated process among point 463 starting Figure 11.Detected key instruction is via point 465 starting calibration adjustment procedure in program block 459.Key instruction in the program block 461 makes operational order jump to process illustrated in fig. 13 via point 467, will describe this process below.
When all key instructions had all met the demands, operational order entered program block 442 (Figure 10 F) via point 440.When setting up mode when logging off, operational order carries out decision block 472 (Figure 10 H) via point 470.If the dynamometer error flag that has not been provided with so, in program block 475, takes the reading from all dynamometers, and, these readings in program block 476, checked, to determine whether from all dynamometers, receiving data.If do not receive, then in program block 478, show the address of the dynamometer of makeing mistakes, and, the dynamometer error flag is set in program block 480.Then, operational order 407 jumps to decision block 410 (Figure 10 B) via point, and, if there is no keyboard activity, then operational order returns decision block 472 via point 470.Because be provided with the dynamometer error flag, so operational order enters program block 432 and 433 (Figure 10 E) via point 430,
There, dynamometer is reset and resets, so that data to be provided.If determine in program block 435: all dynamometers are not all actively replied, so, operational order enters program block 425 and 426 (Figure 10 C) via program block 436 and point 423, to give dynamometer the address once more, then, operational order returns via point 430, and until determined the following fact in program block 435 (Figure 10 E) till: all dynamometers are all actively replied.Then, operational order is via point 440 and decision block 442 (Figure 10 F) and via point 470 and program block 472 (Figure 10 H) and carrying out, so that read the reading of all dynamometers once more in program block 475.
When determine to obtain data from all dynamometers at program block 476 after, operational order enters decision block 487 (Figure 10 J) via point 485, with any error message of checking and the dynamometer data receive together.If receive any this error message, so, this fact is shown in program block 489, and operational order enters program block 410 (Figure 10 B) via point 407.If there is no keyboard activity, then operational order returns via point 470, with in program block 475 (Figure 10 H) once more from all dynamometer sense datas.When definite in program block 487 (Figure 10 J) and dynamometer data received error message together, operational order entered decision block 494 (Figure 10 K) via point 492.If determine to be provided with single dynamometer mark in program block 494, so, operational order jumps to program block 497 (Figure 10 B) via point 496, and there, single dynamometer data are shown.Then, operational order is only via program block 410, perhaps, and via program block 412 and 498 and reentry point 470 (Figure 10 H).
If determine not to be provided with single dynamometer mark at program block 494 (Figure 10 K), then operational order begins in program block 500, so that calibration is from the weight readings of each dynamometer aspect load position, and, these readings are added up, to obtain the general assembly (TW) on this scale.In program block 500, the general assembly (TW) register is cleared, and in program block 501, this register is put N (number of dynamometer in this system).In program block 503, the load position correction constant X of highest sequence number dynamometer from the storer extraction system, and, it is write among the register M.If determine in program block 505: the taking-up of the load position correction constant of dynamometer N is unsuccessful, so, with among several numbers 1 load register M, and operational order is proceeded in program block 506.If in program block 505, determine: successfully take out load position correction constant from storer, so, operational order jumps to program block 510 via point 508, there, the weight readings from dynamometer N be multiply by the load position correction constant X that is stored among the register M
N, then, the gained result is added on the general assembly (TW) register.Then, in program block 512, N is reduced, and this value of check in program block 514 is to determine whether the N value equals zero.If the N value is not equal to zero, then operational order is via point 515 return information pieces 503, there, and next highest sequence number dynamometer drift calibration constants X from the storer extraction system, and among its load register M.
Operational order is proceeded in the same manner as described above, until the weight readings from all dynamometers being multiply by corresponding load position correction constant, and, till in the general assembly (TW) register, they being added up.This moment, program block 514 will determine whether to be added up from the reading of all dynamometers.Then, in program block 517, will from storer, take out the calibration constants of starting point and adjacent scale interval.If determine that in program block 519 it is unsuccessful that described storer takes out, so, will in program block 520, do the demonstration that makes mistake, and operational order will be via point 407 return information pieces 410 (Figure 10 B).If it is successful that storer takes out, so, operational order enters program block (Figure 10 L) via point 522, there, starting point and adjacent scale interval correction constant is added on the weight readings.Then, in program block 527, carry out and automatic zero adjustment and other relevant operations of deduction tare weight.In program block 528, for demonstration weight readings is rounded up and truncation, and in program block 530, show last weight.Then, operational order is via point 407 return information pieces 410 (Figure 10 B), and with the check key disk activity, and each dynamometer of poll is to obtain weight readings.
Return Figure 10 A and decision block 405, above narration supposition is not also with each dynamometer in the imparting system of address.But if determine to give each dynamometer in advance with the address in program block 405, so, operational order can enter program block 540 via point 535, there, will prepare for each dynamometer of poll.Then, in program block 432, under the situation of the instruction of all dynamometers, proceed operation in the manner described above in clear to send.
Figure 11 explanation is used for determining the process of load position correction constant Xj value.Adjust during the scale, in program block 457 (Figure 10 G), begin this process to detect the key instruction.This process is loaded into via point 463, and, in program block 550, the zero load output signal of each dynamometer is read and stored.In program block 551 and 552,, then, make its increment with the zero clearing of weight position calculator.Then, in program block 554, the test weight of unknown weight is placed on first dynamometer, then, in program block 555, reads the output signal of all dynamometers.Then, in program block 557, by deducting zero load reading with described reading nominalization, and, the result who is produced is stored.In program block 560, check whether weight position counting I equals N, that is, and the number of dynamometer in the system.If be not equal to N, operation return information piece 552 (at this place, the weight position calculator is rised in value) and program block 554 (, will test weight and be placed on the next dynamometer) at this place.Operation is carried out by this way continuously, and on each position in N position of test weight, each from N dynamometer obtains till the weight readings of nominalization.
Then, in program block 563, N Bc value all equals individual with the several mean value of N from the reading of a described N dynamometer in the selected equation 2.This has determined the value of the Bc of equation.Then, in program block 565, separate N equation, to obtain the value of constant Xj with N unknown number with above definite Gaussian elimination method.Then, the value of these constants of storage in program block 566, and, determine in program block 568 whether described storer writes successful.If success, then operational order is via point 440 return information pieces 442 (Figure 10 F).If it is unsuccessful that described data write, then in program block 570, send the wrong instruction that shows, and operational order is via point 440 return information pieces 442.
An importance of the present invention is to change the ability of the dynamometer of one or more damages in the multiple load cell scale, and, keep the ability of the scale of new formation being done the load position correction with the difficulty of minimum.Because can monitor and diagnose each dynamometer in the described scale individually, so, the dynamometer of damage can easily be found.When situation about being damaged, new dynamometer is packed in the system, to replace the dynamometer that damages, give new dynamometer the address, and, for new dynamometer is determined new load position correction constant.
The process that Figure 12 A and 12B explanation are given new dynamometer the address.When (Figure 10 G) detects the key instruction of giving the dynamometer address again in program block 446, enter this process via point 448.At the beginning, must disconnect every other dynamometer and bus in this scale system, so that have only new dynamometer to be connected on the bus.In program block 575, should write new dynamometer address via keyboard with reference to Figure 12 from the requirement of the information of display, in this case, new dynamometer address will be identical with the address of the dynamometer of changing, damage.In program block 578, address 240 is write in the address register, then, operational order enters program block 580 via point 579.In program block 580, dynamometer address instruction and new address are transported to dynamometer address (being 240 in this case) in the address register.Then, in program block 581, determine whether from the addressing after dynamometer obtain positive replying.If obtain positive replying, then given new address satisfactorily, then, operational order returns via point 445, so that scan described keyboard in program block 446 (Figure 10 G).Because during manufacturing address 240 is write in all dynamometers, so when the dynamometer of changing is new dynamometer, usually, said process will be so far.
But in some cases, the dynamometer of described replacing may not be new dynamometer, thereby, may have address stored, rather than 240.Under the sort of situation, operational order can enter program block 583 from decision block 581, there, the content of address register is reduced, then, in program block 585, with this content and zero balancing.If the content of address register is not equal to zero, so, operational order returns via point 579, so that a change address instruction and new address are transported to the dynamometer address after reducing, then, in program block 581 inspection is done in positive replying.Operational order is proceeded with this method, until obtain positive replying from the dynamometer of replacing till, perhaps, till the content of determining described address register in program block 585 has equalled zero.Under the sort of situation, the dynamometer that the display indication is not worked is connected in this system, and operational order turn back to program block 442 (Figure 10 F) via point 440.
The dynamometer of replacing owing to pack into must carry out the compensation again of load position aspect to described scale now.Suppose for each dynamometer in this scale, determined load position correction constant in the past, and, suppose that the replacement of only replacing a dynamometer and dynamometer does not influence the correction constant of the dynamometer of not replacing, so, utilize the weight of unknown weight and only two weight readings just can obtain the correction constant of new dynamometer.When load was positioned on the scale with N dynamometer any weight position i, the output through the load position correction of this scale was provided by following formula:
Bi＝(Ai，
1)X
1＋(Ai，
2)X
2＋……＋(Ai，
N)X
N(2)
Wherein, Ai, j are when weight is positioned at position i, and the output reading of j dynamometer, Xj are the correction constants of j dynamometer.
Under the condition of the above supposition that provides, for all dynamometers (except replace that), the Xj value all is known.For example, if the 6th dynamometer will be replaced, so, will calculate new X6.In above equation (2), there are two unknown numbers, that is, and X6 and test weight B.Because there are two unknown numbers, so, only need two equations to determine the value of these two unknown numbers.For the data that need to obtain, at first the test weight with unknown weight is placed on new dynamometer (No. 6) top, and, for each dynamometer in this scale, read reading.Then, unknown weight is placed on the different positions (preferably making the load on the dynamometer of replacement get minimum value), and, read reading from each dynamometer.Following equation (2) has the data that first group number-reading when weight is positioned on No. 6 new dynamometer is produced:
B
6=(A
6,
1) X
1+ (A
6,
2) X
2+ ... + (A
6,
N) X
NFor same unknown weight is placed on, second group of data during No. 3 dynamometer top for example, this equation is:
B
3＝(A
3，
1)X
1＋(A
3，
2)X
2＋……＋(A
3，
N)X
N
If use same weight when measuring for twice, so,
B
6＝B
3
Can be above-mentioned equation simplification:
B
6＝(A
6，
6)X
6＋Z
6
B
3＝(A
3，
6)X
6＋Z
3
Wherein, Z
6Be except No. 6 dynamometer, the sum of products of the output signal of all dynamometers and position correction constant, and Z
3Be except No. 3 dynamometer, the sum of products of the output signal of all dynamometers and position correction constant.
Two unknown numbers are B
6Or B
3(that is unknown weight) and X
6
Because B
6=B
3So,, can have a unknown number X two system of equations are synthetic
6An equation:
(A
6，
6)X
6＋Z
6＝(A
3，
6)X
6＋Z
3
After the arrangement:
With new X
6Value is stored in the storer, is used for the load position correction, and its use-pattern is identical with the correction constant of the dynamometer that is replaced.In above equation (3), No. 6 dynamometer be as the example of the dynamometer that is replaced, and No. 3 dynamometer put the position as second of unknown weight.Certainly, can handle any other position and dynamometer in an identical manner.
Should be pointed out that and can adopt substantially similar process to replace two or more dynamometers simultaneously, and, the value of their load position correction constant obtained.Replace at the same time under the situation of two dynamometers, will need three weight readings, and, three simultaneous equations are found the solution.When three, four of replacements or the whole dynamometer except, can utilize the popularization of said method.
Below with reference to Figure 13, when in program block 461 (Figure 10 G), detecting the key instruction, enter a process via point 467, this process is used for being added to the new dynamometer calculated load position correction constant on the described scale.After the inlet at point 467 places, in program block 600, unknown weight is placed on new dynamometer top, and in program block 601, reads the output signal of all dynamometers.Then, in program block 603, same weight is moved on the new position, and in program block 605, read the output signal of all dynamometers once more.In program block 607, use said method, from the load position correction constant X of the new dynamometer of equation (3) calculating, and, in program block 608, in this constant write store.If determine that in program block 609 it is successful that described storer writes, so, operational order is got back to program block 442 (Figure 10 F) via point 440.If it is unsuccessful that described storer writes, so, operational order jumps to program block 570 (Figure 11) via point 610, makes display display-memory storage errors, and then, operational order enters program block 442 (Figure 10 F) by point 440.
Claims (5)
1. one kind is used for the multiple load cell electronic scales is carried out the method that load position compensates, and may further comprise the steps:
Storage is used for the mathematic(al) representation of the load of load position correction;
Read each digital load meter registration from each described dynamometer; With
Described mathematic(al) representation is used on the described digital load meter registration, with produce on this scale, through the digital watch registration of the total load of load position correction;
It is characterized in that, also comprise in the described step:
In described mathematic(al) representation, each described dynamometer is all comprised an independent load position correction factor;
Store this load position correction factor;
This load position correction factor is combined with corresponding digital load meter registration, so that all provide revised digital load meter registration to each dynamometer, and
Each described revised digital load meter registration is combined, so that the digital watch registration through the revised total load of load position to be provided on this scale.
2. the method for the independent load position correction factor of a dynamometer that is used for determining the multiple load cell electronic scales is characterized in that may further comprise the steps:
Load is placed on the diverse location of described scale; With
Determine the response of described each dynamometer, and utilize this response and make it to comprise described response and described correction factor in conjunction with a mathematic(al) representation to described load.
3. method as claimed in claim 2 is characterized in that, determines new load position correction factor for the dynamometer of changing, and this reaches by following steps:
Load is placed on the dynamometer of described replacing;
Obtain the digital watch registration from each dynamometer; With
Utilize described load meter registration and from the known corrections factor of all dynamometers except the dynamometer that is replaced, with the value of the load position correction factor of the dynamometer of determining described replacing, and
Store the described load position correction factor of the dynamometer of described replacing.
4. method as claimed in claim 2 is characterized in that, described step also comprises:
Load is placed on N the diverse location of described scale, wherein N equals the number of dynamometer in the scale;
Determine described each dynamometer response to described load on each position;
N the equation that utilizes this response and described mathematic(al) representation to go to set up to have N unknown number; And
Separate described equation, to determine N load position correction factor.
5. as one of them described method of claim 2 to 4, it is characterized in that described load has unknown gravimetric value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/126,271 US4804052A (en) | 1987-11-30 | 1987-11-30 | Compensated multiple load cell scale |
| US126,271 | 1987-11-30 | ||
| CN88108278.3A CN1016728B (en) | 1987-11-30 | 1988-11-30 | Compensated multiple load cell scale |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN88108278.3A Division CN1016728B (en) | 1987-11-30 | 1988-11-30 | Compensated multiple load cell scale |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1062036A CN1062036A (en) | 1992-06-17 |
| CN1031222C true CN1031222C (en) | 1996-03-06 |
Family
ID=25742514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91110777 Expired - Lifetime CN1031222C (en) | 1987-11-30 | 1991-11-14 | Method of compensating load position for lultiple load cell scale |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1031222C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9194737B2 (en) * | 2013-12-20 | 2015-11-24 | Mettler-Toledo, LLC | Method of determining vehicle scale health and suitability for use via weight transfer pattern analysis |
| CN111829620B (en) * | 2014-10-09 | 2022-10-21 | 梅特勒-托利多(常州)精密仪器有限公司 | Weighing sensor, weighing network and monitoring method |
| CN105571690B (en) * | 2014-10-09 | 2018-09-07 | 梅特勒-托利多(常州)精密仪器有限公司 | Digital weighing sensor and sensor network |
| CN105737962A (en) * | 2014-12-09 | 2016-07-06 | 安徽柯力电气制造有限公司 | Digital module for electronic weighing device |
| CN106500810B (en) * | 2016-11-15 | 2019-08-20 | 北京万集科技股份有限公司 | A kind of target vehicle weighing method and system |
| CN107607183A (en) * | 2017-08-03 | 2018-01-19 | 上海斐讯数据通信技术有限公司 | A kind of method, intelligent apparatus and intelligence system that weight data is provided |
| CN109855710B (en) * | 2019-03-11 | 2021-04-27 | 耿建航 | Truck scale weighing state monitoring system and detection method |
| CN117724404B (en) * | 2024-02-07 | 2024-04-16 | 北京航天巨恒系统集成技术有限公司 | Position data compensation method and device, electronic equipment and motion control system |
-
1991
- 1991-11-14 CN CN 91110777 patent/CN1031222C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1062036A (en) | 1992-06-17 |
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