CH644205A5 - Device for measuring the rotation angle of a machine shaft relative to a reference angle position. - Google Patents

Description

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PATENT CLAIMS switched additional comparators (3) and

1. Device for measuring the angle of rotation of a shaft blocked or released and the output of the integrator is connected to a machine between a reference angular position of the first input of a further comparator and a shaft and the angular position at the time of entry peak value memory, one of which has a means of the tapping caused by the function of the machine with the second input of the further comparison, at least one voltage divider connected to the reference angle position being connected downstream. Talking encoder is provided and a further encoder is provided. 7. Device according to one of claims 1 to 5, characterized in that when the machine characteristics occur, the counting input of the evaluation phenomenon appears several pulses, including interference Forming counter (10) is connected to an encoder, sends out pulses, which can be fed to an evaluation unit, io which on the shaft of the machine or one which rotates from the time interval between the reference angular position and is characteristic of the machine in a constant speed ratio an angle mark attached to the angle disc responds.

Proportional signal generated, and in which the encoder 8. influenced by the machine according to one of claims 1 to 5, characterized by a non-characteristic appearance, indicates that the counting input of the evaluating input of a comparator is connected to the - 15 unit forming counter (10) is connected to a frequency multiplier with a second input defining its response threshold circuit which is pending from a reference angle of the signal, characterized in that the evaluation position received signal by a factor of a. k multiplies the word unit (10) by means of a reference angle mark which has the output signals of the one, even at k, the angular resolution and a the angle between two threshold values which can be exceeded by interference signals.

Comparator (4) connected to that of a detection circuit (3,6) 20 9. Device according to one of claims 1 to 5, thereby linking logic circuit (6,7,8,9,11,14) characterized in that the counter input of the evaluation and that the evaluation unit (10) is controlled by the counter (10) forming the output unit with a constant frequency on the comparator (4), the time being added and the counter (10) being controlled by a computer connected

span from the last exceeding of the threshold value to the one who receives as second information a speed information input from the comparator (4) before the occurrence of the output position, e.g. by counting the time between two signals from the detection circuit, which corresponds to a characteristic appearance arriving at machine train angle signals with the same frequency, and the arrival impulses, and by dividing the two fen of the reference angle signal for determining the rotation - Values determined a variable proportional to the angle of rotation.

angle by the evaluation unit (10). 10. Device according to claim 2, characterized

2. Device according to claim 1, characterized in that the counter (10) is followed by a memory (12), that the evaluation unit essentially consists of a counter which can be controlled by a reference angle signal (II) and (10), whose count input associated with angle sizes can be fed to the counter content after receipt of this or one of the signals received, and which by an overwrite. conducted signals from the counter (10) takes over.

th of the threshold corresponding signal of a egg 11. Device according to one of claims 1 to 4 and 7th

low to 35 to 10, which can also be exceeded by interference signals, characterized in that the identification switching

Comparator (4) having a threshold value can be enabled and activated by an additional comparator (3 '), one of which is reset by reset signals which preferably deviate from the one input with the input of the one having a low threshold of the response threshold of the comparator (4) having the comparator (4) and the speaking signals derived from it can be reset to zero, the response threshold (A) is above that of the latter, and also that the counting process after the detection has occurred also the output of the additional comparator (3) the signal is maintained and ends with the occurrence of the output of a timer connected downstream of the comparator (4) with a low swelling angle signal or a signal value triggered by it, preferably a new one. • triggerable multivibrator (6 ') linking AND gate

3. Device according to claim 1, characterized, (15) is formed, which forms the evaluation unit that the response level (B) of the comparator (4) enables a 45 counter (10) and a correction circuit provided a constant percentage of the correct Peak value is which corresponds to the delayed start of the machine-characteristic signal caused by the timing element. of the counter (10) compensated and e.g. by an between

4. Device according to claim 1, characterized in that the reference angle transmitter and evaluation circuit are interposed — that the response level (B) of the comparator (4) is formed from a monostable multivibrator (16).

agreed consistent absolute value. 12. Device according to claim 1, characterized

5. Device according to one of claims 1 to 4, characterized in that the function of the logic circuit and the Erken-characterized in that the detection circuit realized by a voltage circuit using a microcomputer additional comparator (3), one input of which are.

Input of the comparator (4) releasing and possibly also resetting the counter (10) is connected and ss

whose response threshold (A) lies above that of the latter, and an additional comparator (3) connected downstream thereof. The invention relates to a device for measuring th monostable multivibrator (6). solution of the angle of rotation of a shaft of a machine between

6. Device according to one of claims 1 to 5, characterized ner reference angular position of the shaft and the angular position, characterized in that the detection circuit by a 60 at the time of occurrence of a function of the Ma-additional comparator (3), whose one input with the machine caused phenomenon, wherein at least one on the input of the counter (10) releasing and possibly responding to the reference angle position, for example a current-resetting comparator (4) with a low boscope is provided and a further transmitter is available, the threshold value is connected and its response threshold (A), which is higher than that of the latter when the machine-characteristic phenomena occur, and one additional 65 additional Pulses, including interference pulses, external comparator (3) downstream switch of a constant det, which can be fed to an evaluation unit, which is formed from the voltage integrator, which switch the Kon-time interval between the reference angle position and the machine constant voltage integrator depending on Switching state of the pre-characteristic appearance an angle-proportional Si

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signal is generated, and in which the encoder is influenced by the machine characteristics. The comparator output also affects the appearance with an input if a fault occurs when the response

is connected to the comparator, on the second gel of which the output level of the comparator e.g. from «low» to

Input a signal «high» that defines its response threshold and is present when the response level falls below. 5 Move "high" to "low". It is therefore possible for everyone

One problem with such devices is the Er transition of the comparator output level from "low" to the generation of an evaluation "machine-characteristic" high with the help of the logic downstream.

nis, e.g. the pressure in the injection line to start the derived process and each time the comparator

Trigger signals which, together with a second trigger output level, stop and return from "high" to "low".

gersignal that clog a defined angular position of the crank 10. This process can be repeated until wave corresponds to the level transition at the comparator output being used from «low» to form the gate signal to be counted. The “high” obtained from the pressure curve is no longer caused by a fault, but by the actual

Ideally, the trigger signal should be at the time of the machine-characteristic signal, e.g. from printing

pressure cycle occurring for the first time in the inlet in the injection line is caused, whereby in this

spray line are generated. However, in order to avoid multiple triggers, the output signal of the detection circuit is overextended, e.g. due to the always existing logic circuit for maintaining the evaluation

Interference signals can be triggered before the actual pressure rise until the reference angle signal can do so, and the trigger pulse only ends when it is exceeded.

a certain pressure threshold in the injection line to be generated by the measures provided according to the invention. This, like the previously known solutions 20, makes it possible to show the threshold value for the comparator low, without further ado, by keeping a voltage comparator, as a result of which the evaluation process is already used immediately, which is based on the processed injection line after the arrival of one Signal can begin. Furthermore, the pressure signal is activated, the response level being detected by the detection circuit during the evaluation

Above the level of the disturbances before the pressure rise, it is possible to determine whether there is a disturbance signal. If the disturbances before the pressure increase are either 25 or not, and in the first case the process is either large, the response level of the comparator must be reset again or selected not to start at all, which makes one very far from. In the latter case, it is possible to delay the evaluation of one of the ideal requirements, an incoming signal when the pressure increases, by a certain period of time.

Generate trigger pulse removed. A fault is defined during which a check is carried out to determine whether it is a useful

According to the present, if a certain threshold, 30 signal acts or not, is possible and the reference angle

e.g. a pressure value that is exceeded and delayed by the same amount of time before the actual signal. So that’s

occurrence of the machine-characteristic event, ensured that the time span between e.g. a rise in pressure, again falls below. the beginning of the machine characteristic signal and

Furthermore, DE-OS 2 347 800 has already given the reference angle signal, which e.g. strike through top dead center, the integrator 35 is triggered after the signal transmitter of a piston of an engine, is taken into account and the latter is connected to a threshold switch.

the. This can suppress interference pulses, the voltage-time advantages of which result when the evaluation surfaces below a certain size, namely the response, essentially consist of a counter, the counting threshold of the threshold switch are located. Signals assigned to the prak input can be supplied, but this arrangement is only suitable for cases in which only short-term interference signals with a high voltage-corresponding signal from a low and a gel occur when the response threshold is exceeded , e.g. Scattered interference signals on longer transmission lines with interference signals exceeding a threshold value. The disadvantage of such a circuit comparator, which can be released and by means of reset signals, is that the evaluation of the usefulness of the falling below the response signals takes place with a delay which corresponds to the signals corresponding to the selected 45 threshold of the comparator It is dependent on the size of the voltage-time area to be suppressed that it can be reset to zero and that the counting process depends on the coordinated response threshold. Maintained after the detection signal occurs However, the delay is by no means determined with regard to and with the occurrence of the reference angle signal or its duration, since this depends on which one of the signals triggered by it ends. In this case waveform has the incoming signal. So the evaluation circuit is characterized by a special task of the invention is to provide a possibility of simplicity and functional reliability.

If it allows, even in the event of major disruptions, it is also possible for the evaluation unit to consist of a computer-type entry, which is advantageous in this case

Event-indicating signals, a trigger pulse with regard to the further evaluation of the determined win

nerieren, which give the ideal as close as possible 55 kelwert.

is coming. The solution to this problem is achieved according to the invention. A particularly expedient embodiment of the Er is achieved in that the evaluation unit is characterized by the fact that the detection switching signal signals of the one are also exceeded by interference signals by an additional comparator, one of which A comparator having a threshold value is connected to that of a comparator, which may or may also be a reset, to the input of the logic circuit enabling the counter and counter-detection circuit, and that the evaluation unit of the output and its response threshold lies above that of the latter , so-signals of the comparator is controlled, the period of time being formed like a monostable multivibra connected downstream from the last exceeding of the threshold value at the input of the gate. It is thus possible in a very simple and reliable comparator before the output signal occurs in such a way that it recognizes the machine-characteristic signal, which knows a machine characteristic, the response threshold being relatively high, and the arrival of being can, so that the interference signal occurring before the actual machine tension angle signal for determining the angle of rotation characteristic signal is certainly used by the evaluation unit. no change in the switching state of the comparator

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of the detection circuit. The downstream monok in turn means the angular resolution and a the angle between two best-stable multivibrators, which means that per working angle means marks.

Cycle only one signal is sent to the logic circuit and for particularly high demands on the resolution and not caused by reflections according to the maschi measurement accuracy, it is advantageous if the counting input of the characteristic signal occurs interference signals, the counters forming the evaluation unit with a constant can reach considerable level values, the logic is affected, the frequency is applied and the counter with a computer outside. connected as a second piece of information a speed

There are also other options for formation, e.g. by counting the time between formation of a detection circuit. Thus, these two reference angle signals with the same frequency can also be formed by a differentiating element which can be supplied with 10 pulses and which, by dividing the signal, which is dependent on the increase in the signal level, determines a value proportional to the angle of rotation. In terms of mechanical engineering, it can also be examined with a minimum duration, both according to its level value or according to a specific case, which makes it possible to find the reference angle position of the shaft to find the machine-characteristic signal of disturbance signal failures. so that there is a very simple structure to distinguish len and in the former case a signal to 15 results.

To deliver logic circuit. In addition, it is also possible in some cases to be able to reduce interfering signals as a result of the fact that proportional signals can be processed in a simple manner to fall below a certain minimum duration, so that it is advisable if this detects a memory. is switched, which is controllable by a reference angle signal

Another expedient embodiment is 20 and the determined value after receiving this or one is characterized in that the detection circuit takes over by a signal derived therefrom.

Additional comparator, one input with the input. The invention will now be described in more detail with the aid of the drawing of the counter releasing and possibly also refining. Show:

reset comparator with low threshold Fig. 1 shows the circuit of a preferred embodiment

connected and its response threshold above that of the 25 game,

the latter lies, as well as the additional comparator FIG. 2, the voltage diagrams at different point

1 and tors is formed, which switch the constant voltage in- Fig. 3 shows a further embodiment of the invention, tegrator depending on the switching state of the upstream additional- The prepared, of which the machine characteristics -

comparator resets and blocks or releases 30 see event, e.g. the increase in pressure in the injection line, and the output of the integrator with the first input-detecting encoder signal I is connected via a capacitive further comparator and a peak value memory tive coupling circuit 1 to a peak value memory 2 and one with its center tap with the two comparators 3 and 4 supplied. The comparators connected to the second input of the further comparator receive a reference chip voltage divider at their respective second inputs. The reference signal for 35 voltage which is derived from the peak value of the signal, e.g. of a pressure comparator and, if appropriate, also for that of the results, which is derived and formed in the voltage divider 5. The identification circuit can receive a reference voltage A from the peak value of the mA comparator 3, which e.g. in the case of signals characteristic of the line as well as of an absolute 65% and the comparator 4 a reference voltage B, the loud value being derived. e.g. is 17% of the peak value of the pressure signal. The

In addition, provision can also be made for the detection 40 output voltages of the two comparators 3 and 4 to be connected by an additional comparator thereof in FIG. 2. The comparator 3 is followed by a monostable input with the input of a low flip-flop 6, which ensures that a comparator having a working threshold value is connected and only one pulse in the injection line at the output whose response threshold is above that of the latter is connected, and tilt level 6 is obtained. The comparator 3 and the mono-one the output of the additional comparator with the «stable multivibrator 6 together form the detection circuit output of the comparator with a low threshold value. With the output pulse of flip-flop 6 and a downstream timing element, preferably a re-trigger-processed reference position pulse II, which e.g. a bistable multivibrator-connecting AND gate is formed, a bistable flip-flop and a correction circuit is provided, which controls the 7, is provided at the top dead center of a piston by a loading device which releases the counter forming the evaluation unit.

Delayed starting of the counter due to the timing element. The output signal of the bistable multivibrator 7 is shown in FIG.

compensated and e.g. represented by a between reference angle 2. The comparator 4 is also followed by a monostable and evaluation circuit interposed monostable multivibrator 8, which is formed with each negative len multivibrator. Edge of the comparator output signal a short im-

A very simple way of implementing the pulse generated by 55, as shown in Fig. 2. The output signals, the machine-characteristic signal and the reference angle of the flip-flops 7 and 8 are defined in an AND-stage 9 ver-signaled gate signals, that the counter links and then deliver the zeroing signals IV for the toughness input of the counter forming the evaluation unit with one 1er 10. In an OR stage 11, the output signals are connected, which is linked to the shaft of the machine of the bistable flip-flop 7 and the comparator 4, or one with this in a constant speed change <> 0 with the bistable flip-flop 7 connected one-ratio rotating disc or the like. attached angle range an inverter 14 is connected upstream. At the OR stage 11 ken responds. you get a signal V for releasing the count of

Another, in view of the constructive execution angle mark pulses III, which e.g. at a distance of e.g. tion of the measuring device simpler configuration of the invented 0.1 ° of the shaft rotation to the counter 10, which results in the dung when the counting input of the evaluation unit forms the evaluation unit. The downstream of the unit forming unit 10 with a frequency multiplier memory 12 is connected from the output of a monostable device which receives a signal obtained by a reference angle position flip-flop 13 which is triggered by the output of flip-flop 7 by a factor of a. k multiplies, where it is ert, and which on each positive edge of the output

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gnales the flip-flop 7 delivers a short pulse, the command. The bistable multivibrator 17 controls the output side to take over the counter reading. The counter 10 remains in the memory 12, the angle information processed via an AND gate 19, e.g. corresponds to the start of conveyance angle until mark impulses III can be fed, and which is followed by a memory 12 for forming a new angle value for the following operation, which is controlled by an edge stored by the example and can process 5 signals coming from the multivibrator 16 for further processing can be easily read out. It is of course also possible to take over the counter 10.

Comparator 4 with a fixed reference value - If the threshold value of comparator 4 is exceeded,

gene, e.g. corresponds to a pressure of 30 bar. the multivibrator 6 'is triggered and tilted and delivers e.g. logic 0 at its output. A further embodiment of the invention has a running time, which each time the threshold is exceeded, is that the counter 10 does not run angular mark pulses, the corresponding signal from the multivibrator 6 ', and counts the binary frequency with constant frequency f] - starts, the threshold value of the comparator 3 is exceeded, then information VI of the counted impulses a computer is assumed that the comparators 3, 4 are guided at their threshold. As a second piece of information, the computer will be supplied with a logically L input signal that exceeds values; Speed information supplied, e.g. by counting 15 the AND gate 15 emits a signal after the expiry of the multivibrator between two reference position signals with the same 6 'and switches the bistable multivibrator 17 counting frequency f, is formed. By dividing the two by and this releases the counter 10 and simultaneously enables binary information supplied to the computer and a simultaneous switching of the angle mark pulses III for the duplication with a specific counter 10 which defines the resolution.

Size, the angle information is obtained. 20 If a reference position pulse II arrives, the multi

In the embodiment according to FIG. 3, the activator 16 is triggered, which has the same transit time as the multide comparators 3, 4 also via the capacitive coupling vibrator 6 '. After the multivibrator 16 has expired, the pel circuit 1, the spizen value memory 2 and the voltage are switched over on the input side with the corresponding reference values bistable multivibrator 17 by the switching edge of the divider 5 caused by the tipping back, and the further or the processed signal I supplied by the encoder is switched 25 Switching through the angle mark pulses III to the counter 10 ensures. The comm having the lower threshold value and after the expiry time of the time delay parator 4 has a retriggerable monostable multivibrator 18 which resets the counter 10 to gate 6 ', the output of which is connected to an AND gate by the tilting back of the multivibrator 16 conditional 15 is connected, the second input of which is connected to the switching edge output before the counter 10 of the second comparator 30, which has the higher threshold value, is reset for the transfer of the counter reading into the memory 12. causes.

This AND gate 15 is connected to an input of a bistable. In this embodiment, the start of the len multivibrator 17 is connected, the second input of which is evaluated by a certain time and defined by the running time of the monostable multivibrator 6 ′ controlled by the reference position pulse II is delayed and connected by the Ver multivibrator 16 and has the same expiry time as the 35 delay of the reference position pulse II by the same time — the multivibrator 6 '. span balanced by means of the multivibrator 16.

C.

2 sheets of drawings