DE19634513C2 - Method for correcting a tap error resulting from the volume measuring device during the tapping of a flowing medium and volume measuring device for carrying out the method - Google Patents

Description

The invention relates to a method for correcting a when tapping a flowing medium on the part of the volume measuring device within a Zapfzy The resulting tap error, with the volume measuring device flowing from one the medium is rotatable volume transmitter element, in particular a Impeller, this associated detector means that ei for detecting the rotation nem certain pulse signals deliver corresponding pulse signals, and a Re Chen means for determining the flow volume based on that of pulse signals supplied to the detector means, each pulse signal being one corresponds to predetermined volume increment, being within the scope of the determination of the flow volume of the tap cycle is at least one independent of the tap time pending correction value is taken into account.

Volume measuring devices are known to exclude any Measurement errors in continuous operation calibrated and certified. This is usually done by art that work with flying start-stop operation, d. i.e. at constant Flow is measured a predetermined amount and depending on the meter result of the volume measuring device calibrated accordingly. There are certain maximum error limits allowed. However, this compensable error occurs an additional tap error, especially for short-term taps. This comes about because the volume transmitter element is sluggish when starting due to safety and friction (fluid friction and bearing friction) not immediately, but only after a certain start-up time the ent of the respective flow speaking (constant) speed of rotation reached. During this acceleration cleaning phase can be some compared to a constant continuous flow Rotations are lost, so that too little volume is added when turning becomes. In contrast, at the end of the tap cycle, due to inertia, the flow is stopped, a wake that is larger the larger the Flow and thus the speed of the volume sensor element, i.e. the wing that is. Too large a volume is added. Would start and stop The amount of errors equal in amount, they would cancel each other out.  

As a rule, however, the amounts of the two errors are different, so that there is a net error, with the stop error generally predominating. The net error is inversely proportional to the tap duration, i.e. that is, the shorter the tap cycle, the more serious the error is. So the tap mistake plays at all mainly for short-term taps such as washing hands, flushing the toilet and a role in the kitchen, while in the bath, shower, dishwashing and Washing operations are usually negligible.

It is important to correct the beginning and end of the correct the tap cycle. The description of this in DE 39 15 299 A1 and DE 44 11 738 A1 Nomenclature are very complex and complex.

The invention is therefore based on the problem, a method of ge specified type that allows the beginning and end of a to corrective tap cycle easy to recognize, and a simple one and enables reliable correction.

To solve this problem is a method with the above Features provided according to the invention that to recognize the beginning and a timer is used at the end of a dispensing cycle to be corrected is reset each time a pulse signal is given and then expires, the maximum duration of the timer at least the maximum time stood between two given by a rotation of the volume element Corresponds to pulse signals, with the temporal pulse signal sequence bezo conditions is evaluated for the timer duration.

This simple procedure uses a reset with each pulse signal Timer, e.g. B. a monoflop or an electronic timer, which then eats expires. The running time of the timer corresponds at least to the maximum Time interval between two given pulse signals when the encoder rotates lements, d. that is, if it turns as slowly as possible. Is the timer at If a pulse signal has not yet completely expired, the tap runs still running, if it runs without giving a pulse signal, the encoder element is  no more medium flows, the tapping is finished. The end of the cycle is determined with it. If a pulse signal is now given again, this means that a new dispensing process begins, d. that is, the start of the tap is recorded.

The method is based on the fact that at least once for each tap cycle certain correction value is taken into account, which is independent of the tap time. Because it has been found that the tap error is independent of the tap time and it is consequently possible to make an unweighted correction in this regard value. This is calculated with the flow volume determined men, which is determined by the fact that each pulse signal Volume increment is continuously added, or which after completion the tap cycle is determined on the basis of the added number of pulse signals, linked, for example added or subtracted from it, be is due to the fact that the stop error is more powerful. Alternatively it is of course also possible not to use a volume value as a correction value set, but a correction pulse signal number, which of the added Pulse signals are subtracted or added. In this way it is possible to largely eliminate the tap error that arises with each tap cycle.

The first correction value can be a predetermined value. By appropriate Linking this predetermined value can be sufficiently Get bug fixes. Expediently in this context be provided that the first correction value, which by experiments for each Meter type can be specified specifically while the tap is running cycle or after completion of the same is taken into account because the Error correction can take place here regardless of the current cycle status, since a predetermined fixed correction value is always taken into account. So it is possible to carry out the correction immediately after the start, in which In the event of an initial correction, subtracted a little too much, for example if the stop error is overweight because it has not yet occurred is. However, this overvaluation advantageously compensates for itself when the tap cycle has ended and the stop error has occurred. Alternatively, this can  Type of correction at any time during the tap cycle or after loading expiration of the same.

It has been found in tests that the tap error Correction volume or the tap error correction pulse number over very large areas is approximately proportional to the flow. This results in further training according to which the first correction value by arithmetic link a constant with the flow determined in the tap cycle is averaged, the flow by counting the pulse signals during a certain predetermined period of time and corresponding evaluation can be determined is, so that in this way an optimal for all tapping times and flows Allows error correction. Again, this is done with adaptation to the deed a one-off correction regardless of the tapping time. This correction value can also, as soon as it is determined, during or after Been the tapping cycle can be linked mathematically.

Any dependencies of the tap error on the flow and / or the temperature rature of the medium and / or the spatial orientation of the volume measuring device consideration, it can be provided that the constant is dependent speed of the flow rate and / or the temp determined during the tap cycle rature of the medium and / or the spatial alignment of at least one predetermined, possibly dependency-specific set of constants is selected in order in this way by the parameter dependency given nonpro sufficient proportionality to be taken into account.

The one-time consideration of a tap cycle-specific correction value takes into account, as described at the beginning, the start and stop conditions Tap error, d. H. the errors that result from switching between standstill and (constant) useful flow result. During the current cycle but also due to any changes in the flow caused by tap errors generated, which are based on the fact that the impeller with an increase in flow also lags behind due to inertia, but the impeller on removal runs after. To counteract this, the present invention can also be used  hen be that at least one form of change during the current tap cycle of the flow (increase or decrease) is detected, and for each detec a change depending on the type of change further correction value is taken into account. According to this inven The alternative is particularly advantageous either every flow change, So every increase or decrease is taken into account, or for example only that Flow increases or only the flow decreases. That means starting depending on a detected increase in flow, for example a white tere correction value is added, whereas, for example, with a detec tated decrease, a further correction value is subtracted to the respective Compensate for errors. It can with regard to a different weight tion of the increase and decrease-related errors can also be provided that the or further correction values assigned to the detected types of change are determined, with the further corrections upon detection of both types of changes values are chosen differently in terms of amount, so that it is possible to weighting errors related to flow decrease, as well as regarding the stop error is the case. This additional correction value can also, if nope be taken into account at any time during or after the tap cycle.

In addition to the method according to the invention, the invention also relates to a volume Menmeeinrichtung for performing the method described, comprising a volume transmitter element that can be set in rotation by the flowing medium, ins particular an impeller, associated detector means for detection deliver pulse signals corresponding to a certain angle of rotation, and a computing device for determining the flow volume based on the pulse signals supplied by the detector means, each pulse signal being a corresponds to a specific volume increment, with the computer device for loading arithmetical consideration of a Kor regarding each tap cycle rectification value is formed.

This volume measuring device according to the invention is characterized in that Means for recognizing the start and end of the Zapfzy to be corrected Klus are provided, which include a timing element, which with each detection  a pulse signal is reset and then expires, the maximum Runtime of the timer at least the maximum time interval between two at corresponds to a rotation of the volume transmitter element given pulse signals, whereby to recognize the temporal pulse signal sequence related to the timer operation time is evaluated.

As already described at the beginning, the focus is on one-time loading consideration of a runtime-independent correction value for each tap cycle. This means that such a tap cycle is reliably detected, so that the Tap error volume or tap error correction pulse value is not incorrect is taken into account mathematically if a tap cycle has not actually started Has. In order to do justice to this, means for detection are based on the invention the beginning and / or end of a tap cycle is provided so that security is that an actual tap cycle in need of correction actually is present.

According to the invention, the means include a back when a pulse signal is determined adjustable timer, the duration of which is at least the maximum time between corresponds to two pulse signals, with the temporal pulse signal sequence for detection is evaluated with regard to the triggered timer duration. By this inventive connection of the temporal pulse signal sequence with the Ab run of a resettable timer can with particular advantage Dispensing cycle can be reliably detected. Because due to the bearing friction ever the volume transmitter element, i.e. each impeller, a function-related maxi time for a full or partial revolution, depending on what is detected, in the loading rich in a few seconds. Slower can then be too large due to the then Frictional movements do not occur. Is this from the resettable The maximum time given as the running time elapsed without the detector having tel have given a new signal, breastfeeding can be particularly advantageous status of the counter can be determined. As advantageous with every pulse signal supplied the timer is reset, a new rotary movement can then de be detected if a pulse signal is generated when the timer has not yet expired is finished, which leads to a corresponding volume increment  is taken, or the pulse signal is added accordingly. In contrast then, if a pulse signal is delivered after the timer has expired, ge be concluded that a new tap cycle begins. This realization then comes across with particular advantage to the correction process, depending on whether it is too start of the tap cycle, during the run or after the end of the run follows.

A simple realization of the timing element can take the form of a monoflop or a electronic timing element, possibly in the form of a data program.

The correction value can be a predetermined value, alternatively the Computing device for determining the first correction value by arithmetic Linking a constant with that determined during the tap cycle Flow can be formed. Any dependencies of the tap error of the flow, the medium temperature and / or the spatial orientation take into account, the computing device for selecting the constants in Dependence of the flow rate and / or determined during the tap cycle the temperature of the medium and / or the spatial orientation from little at least a given, possibly dependency-specific set of constants be educated.

In addition to the tapping error caused by the start-stop, any errors that may occur To be able to take into account flow-related errors can be means for detecting at least one form of change in flow (Increase or decrease) during the current tap cycle, wherein the computing device for arithmetically linking at least one further signs, depending on the form of the detected change affected correction value with the initially determined flow volume or the number of pulse signals added up within the cycle, the or the con be determined continuously during the current cycle, depending on a detected change is formed. The correction can, for example be such that increases occurring repeatedly in the course of a cycle are added and an overall error due to increase is determined,  which subsequently arrives, or that, for example, the acceptance-related errors be determined, or that the errors are compensated for, so that virtually only the net error value is determined on the computer device side and in the calculation is received.

The further correction value can also be a predetermined value, each A specific additional correction value can be assigned to the form of the change, these can then be different in terms of amount, in order to increase and decrease to be able to weight errors caused by the taking advantageously differently.

According to the invention, the computer device can have at least one memory device device in which the first predetermined and / or the further predetermined Correction value and / or possibly the constant and / or possibly constant family sets are.

Further advantages, features and details of the invention result from the in the example described below and with reference to the drawings. Here zei gene:

Fig. 1 is a flow-time diagram,

Fig. 2 is a pulse signal corresponding to the time diagram shown in Fig. 1 flow rate, the ideal case of performing,

Fig. 3 shows a pulse signal corresponding to the time diagram shown in Fig. 1 flow rate, the real case, performing,

Fig. 4 is a flow volume-time diagram corresponding to the ideal and real pulse sequences of FIGS. 2 and 3, and

Fig. 5 shows the timing of the timer.

Fig. 1 shows a flow-time diagram, the time t is plotted along the abscissa, the flow Q along the ordinate. An idealized flow curve 1 is shown , starting from a zero flow at time t ₀ on the tap flow Q _Z jumps, which remains constant over time t _Z at time t ₁ , after which the flow rate drops abruptly to 0. The volume flowed here is calculated as V = t _Z. Q _Z. FIG. 2 shows the pulse signals 2 delivered by the detector means, which are generated due to the flow-related rotation of the impeller. In the ideal state, the impeller would turn on immediately without a time delay, which is why the first pulse signal is given at the right time, which also applies to the last signal, since the impeller would not run in the ideal state. The pulse signals shown in FIG. 2, of which each pulse signal 2 is occupied with a specific, for example continuously added, volume increment for determining the total flow volume leads to the step-shaped curve A shown in FIG. 4. Each pulse signal supplied in accordance with FIG. 2 corresponds to a volume increment level a, where the levels are always the same due to the occupancy of each pulse signal with a constant volume increment. As can be seen, the volume increment addition ends at time t ₁ and the volume curve A enters the constant value. In this case there is no tap error volume to be compensated.

This contrasts with the real case shown in FIG. 3. Here, too, time is plotted along the abscissa, the real pulse signal sequence along the ordinate. Obviously, the first pulse signal 2 is given at a much later time, since the starting of the impeller is delayed due to friction. According to curve B in FIG. 4, this delayed start-up leads to a first volume increment b taken into account much later. After the impeller has been turned on, the pulse signals are given continuously; an error only occurs again when the actual flow has ended, i.e. at time t ₁ , but the impeller still lags due to inertia, which is indicated by the last three pulse signals 2 ', which are given at a time when the impeller ideally should stand in and of itself. The three pulse signals 2 'lead to three volume increment additions b'. In comparison to the ideal case, the first volume increment b 'must also be taken into account, since this leads to the total volume determined according to curve A. The two other volume increments b ', however, represent the stop error ΔQ _Z , as indicated in FIG. 3. This volume is the lag-related Zapffeh ler, which must be corrected. In order to do this justice, the correction value is taken into account once per tap cycle, ie in this case a correction value in the size of two volume increments would ideally be subtracted. This is taken into account approximately by taking into account a predetermined correction value or by corresponding constant-dependent calculation of a correction value based on the actual flow.

In order to be able to reliably identify a tap cycle to be corrected, the timing element is provided. Fig. 5 shows the course of the timing element in the form of the curve 3. This is reset at the time t ', the time t' corresponding to the time in which in the real case the first pulse signal 2 (see FIG. 3) is given and the first volume increment is added. The timer runs with a predetermined runtime, which corresponds to the maximum possible pulse distance, which is determined by the design of the impeller bearing. With each given pulse signal, the timer is reset, ie the running time starts again. The timer is finally reset at the time t ", which corresponds to the time of the last pulse signal 2 'given. The timer then expires completely, as indicated in FIG. 5 by the time period t _g . This time which is at least equal to that The maximum pulse interval corresponds to the basis for the detection of the end of the tap cycle or the beginning of another tap cycle, because if no further pulse signal is given during this time, it can be assumed that the impeller is stopped If t _g in turn delivers a pulse signal, this represents the start of a new tap cycle, which means that the correction method is initiated at whatever time.

Claims (21)

1. A method for correcting a when tapping a flowing medium on the part of the volume measuring device within a tapping cycle results in the tap error, the volume measuring device being a volume transmitter element that can be set in rotation by the flowing medium, in particular an impeller, associated detector means for detecting the rotation of a particular one Angle of rotation provide corresponding pulse signals, and has a computing device for determining the flow volume based on the pulse signals supplied by the detector means, each pulse signal corresponding to a specific volume increment, with at least a correction value that is independent of the tap time being taken into account arithmetically when determining the flow volume of the tap cycle is characterized in that a timer is used to recognize the beginning and end of a tap cycle to be corrected, which is reset and on each time a pulse signal is given concludes, the maximum running time of the timing element corresponds at least to the maximum time interval between two pulse signals which can be given when the volume transmitter element is rotated, with the timing pulse sequence being evaluated in relation to the timing element running time for detection. 2. The method according to claim 1, characterized in that a timer Monoflop or an electronic timer is used. 3. The method according to claim 2, characterized in that as electronics cal timer a data program is used. 4. The method according to any one of the preceding claims, characterized records that as part of the determination of the flow volume of the Tap cycle at least one first correction independent of the tap time value by arithmetical link with the first determined through flow volume or the number of pulse signals added up within the cycle le, the or the particular continuously during the current Zy  clus be determined, is taken into account, in particular subtracted from it is, the correction value taking into account both the start-up and the follow-up of the volume transmitter element the fault components of the tap fault is designed. 5. The method according to claim 4, characterized in that the first Kor correction value is a predetermined value. 6. The method according to claim 4, characterized in that the first Kor correction value by mathematically linking a constant with that in the Specific flow rate determined during the tap cycle. 7. The method according to claim 6, characterized in that for consideration adjustment of a dependency of the tap error on the flow rate and / or the Temperature of the medium and / or the spatial orientation of the volu menmeeinrichtung the constant as a function of the Tap cycle determined flow and / or the temperature of the medium and / or the spatial alignment from at least one predetermined, if necessary, dependency-specific set of constants is selected. 8. The method according to any one of claims 4 to 7, characterized in that at least one form of change during the current tap operation of flow (increase or decrease) is detected, and to each detected change depending on the type of change further correction value which is affected is taken into account arithmetically. 9. The method according to claim 8, characterized in that the or the detected further correction values assigned to change types are determined, the further ones being detected when both types of change are detected Correction values are selected differently in terms of amount. 10. The method according to any one of claims 4 to 9, characterized in that that the first correction value and possibly the further correction value (s)  during the current tap cycle or after the end of the same are taken into account, in particular subtracted. 11. Volume measuring device, comprising a of the flowing medium in Dre displaceable volume transmitter element, in particular an impeller, this associated detector means which for detecting the rotation of a certain pulse angle corresponding pulse signals deliver, and a Re Chen device for determining the flow volume based on the pulse signals supplied by the detector means, each pulse signal corresponds to a certain volume increment, the computer device computational calculation for each tap cycle a correction value is formed, characterized in that that means to recognize the beginning and end of the correct the tap cycle are provided, which comprise a timing element, which at each acquisition of a pulse signal is reset and then from runs, with the maximum running time of the timer at least the maxima len time interval between two when the volume control element rotates pulse signals that can be given, whereby the temporal Pulse signal sequence is evaluated based on the timer runtime. 12. Volume measuring device according to claim 11, characterized in that the timer is a monoflop or an electronic timer. 13. Volume measuring device according to claim 12, characterized in that the electronic timer is a data program. 14. Volume measuring device according to one of claims 11 to 13, characterized in that the computing device for arithmetically linking each tapping cycle ( 1 ) at least one first, independent of the tapping time correction value with the flow volume initially determined or the number of pulse signals added up within the cycle ( 2 , 2 '), which is or are determined continuously during the current cycle, the correction value processed on the computer device side being designed to take into account the error components of the tap error resulting from both the startup and the lag of the volume transmitter element. 15. Volume measuring device according to claim 14, characterized in that the first correction value is a predetermined value. 16. Volume measuring device according to claim 14, characterized in that the computing device for determining the first correction value arithmetical linkage of a constant with that in the context of the tap cycle specific flow is formed. 17. Volume measuring device according to claim 16, characterized in that the computing device to take into account a dependence of the dispensing error (Δ Q _Z ) on the flow and / or the temperature of the medium and / or the spatial orientation of the volume measuring device for selecting the constants depending on the Within the scope of the tap cycle determined flow and / or the temperature of the medium and / or the spatial alignment of at least one predetermined, possibly dependency-specific set of constants is formed. 18. Volume measuring device according to one of claims 14 to 17, characterized characterized in that means for detecting at least one form of a Change in flow (increase or decrease) during lau fenden tap cycle are provided, and that the computing device for mathematically linking at least one other, depending on the Form of the detected change with signed correction value the initially determined flow volume or the number of inside the pulse signals added to the cycle, the one or more continuous be determined during the current cycle, depending on one detected change is formed.   19. Volume measuring device according to claim 18, characterized in that the further correction value is a predetermined value. 20. Volume measuring device according to claim 19, characterized in that a specific additional correction value is assigned to each form of change is net, the amount of correction values being different. 21. Volume measuring device according to one of claims 14 to 20, characterized characterized in that the computing device is at least one memory has direction in which the first predetermined and / or the further before determined correction value and / or, if appropriate, the constant and / or if necessary, the constant family is stored.