SE421247B - CLUTCH DEVICE TO COMPRESS THE INFLUENCE OF SYSTEM-CONDUCTED PHASE AND AMPLIFIED PROJECTS IN SENSOR SENSOR SENSORS SENSING A WHEEL PROCESS - Google Patents

Description

7807025-7 This blocks the reception of the period length counter's counter indication over a defined number of the periods of the period length signals and is released again only after the counter indication corresponding to the defined number of edges of the edge counter has been reached. Through this measure, the duration of the error suppression is variable and can be optimized according to the existing conditions. Of course, it is also possible to trigger the flank counter in each half or quarter period, if no long interruptions in the period counter's are systemically permitted. If the switching signal which produces the phase jump is diverted from a frequency threshold step, there is a danger of a switching oscillation (also called "flicker ring"). to prevent this, the measures according to claim 4 and in suitable further development the measures according to claim 5 are foreseen. Through these measures, it is achieved that the edge counter must first count to a certain 1 pre-adjustable counter indication, before a renewed switching signal can become effective. Even in this case, it may be necessary not to block the threshold step for too long, so that in some cases the blocking of the threshold step is again lifted already after each counting step performed by the flank counter. In particular, the coupling threshold need not be blocked further than the storage device. The present invention will be described in more detail with reference to the accompanying drawings, which show exemplary embodiments and in which Fig. 1 shows a principle coupling for the coupling device according to invention one, and Fig. 2 shows a principle coupling for the coupling device according to the invention. in the case that the switching signal which produces the phase jump is derived from a frequency threshold value step.

In Fig. 1, a wheel course sensing sensor is denoted by the reference numeral 2. The sensor signals are applied to an analog processing stage 4. The output signals from this stage reach the CE input of a period duration counter 6 and the clock input of a flank counter 8. The period counter 6 is triggered by a clock pulse 10.

"After the period length counter 6, a storage coupling 12 is coupled to take over the always assigned one or more period lengths, counting the indication for further processing in a coupling circuit (not shown).

The output corresponding to the flank counter's highest bit or counter indication is connected to the output of the analog processing stage 4 in an AND gate 14, its output is connected to the clock input of the storage device 12. To the reset input of the flank counter 8, provide connection signals. which causes phase or amplitude jumps in the sensor signal sequence. Such coupling parts, which may be, for example, a frequency threshold stage, are currently considered to be contained in the analog processing stage, so that the reset input of the edge counter is sematically connected via a line 16 to the analog processing stage.

The coupling according to Fig. 1 works in the following way. The analog processing step 4 generates period length signals, which are evaluated in the period counter, in that counting pulses from the clock generator 10 are counted during the time for one or possibly several periods. After each counting process, the counter indication is taken over from the period counter by the storage connection 12 for further processing in an evaluation connection (not shown). If the signal obtained in the analog processing step is encumbered with a phase jump or amplitude jump, produced by a coupling arranged for the machining operation, the coupling signal from this coupling is used to reset the edge counter. The edge counter 8 is reset with the edge of this switching signal. This prevents false counter indications from being transmitted to the storage coupling 12. After the reset, the edge counter counts a predeterminable number of edges of the period length signals which are controlled over the clock input and over the AND gate 14 the switching device 12 is locked for as long as its counter indication Qn is achieved. When this counter indication is reached, the storage connection is released synchronously again to take over the just waiting counter indication in the period counter 6.

The duration of the error suppression can be easily varied and thus optimized when using a suitable edge counter. If long counter interruptions are not permitted, it is advisable to trigger the edge counter every half or quarter period.

Reference will now be made to Fig. 2, which shows in particular the use of the switching device according to the invention in the presence of a frequency threshold step 20. In the presence of such a frequency threshold step, the switching signals of which cause phase jumps, there is the risk of a switching oscillation. Such a clutch oscillation shall prevent the clutch according to Fig. 2. As in the connection according to Fig. 1, the signals from a sensor 22 are applied to an analog processing stage 24, the output signals of which are applied to a period length counter 26, a flank counter, for example with a counting range Q0 to Qm, and a monostable flip-flop step 30. From the counting range Q0 to Qm, the count states Q1 to Qm are connected, for example, to an OR gate 32, the output of a 7807025-7 “output in an AND gate 34 is connected to the output of the analog processing stage. The output of the AND gate is again, as in the connection according to Fig. 1, connected to the clock input of a storage connection 36, which after corresponding triggering takes over the relevant counter indication from the period length counter 26. The output of the frequency threshold stage 20 is connected to the mono input. - set the rocker stage 30, the output of which is connected to the reset input of the edge counter 28. The output terminal of the edge counter 28 corresponding to the always selectable highest counter indication is connected together with the output of the analog use stage in an AND gate 38, the output of which is connected to the input of the frequency threshold stage.

The monostable toggle stage 30 is triggered by the positive as well as negative edges of the applied signals. It really only serves to always briefly reset the flank counter. In principle, the circuit counter could also be reset by the coupling signal itself, as already with the coupling according to Fig. 1. The coupling in Fig. 2 operates in the following way, only the essentials within the framework of Fig. 2 being described. When a first switching signal occurs, which causes a phase jump in the period length signal, the monostable toggle stage recognizes the switching edge and resets the edge counter. The edge counter must now first count from Q0 to Qm, before a renewed switching signal can take effect, since the AND gate 38 is first released at a high level signal on the Qm output. This measure surely prevents a clutch oscillation in the clutch threshold value step. In order to be able to release the storage coupling 36 earlier than the coupling threshold 20 in special applications, the AND gate 34 can be released earlier, which can be achieved, for example, by also coupling the existing counter indications before the counter indication Qm to the AND gate 34 as shown in fig. 2 via the fan counter za and the OR gate 32. The storage coupling 35 is blocked over the AND gate 34 for taking over the counter indication of the period length counter 26, while the edge counter is in a count state between Q0 and Q1. In position Qm, the edge counter remains standing until it is reset by an additional switching signal.

Claims (5)

7807025-7 8 (P a t e n t k r a v = Coupling device, in particular: for use in the protection of protected vehicle brakes to suppress the influence of system-related phase and amplitude jumps in signals from the wheel-course sensing sensors, after which an analog-processing step evaluating the sensor signals is coupled for the recovery of period-lengths. period length signals, which are evaluated in a period length counter, characterized in that after the analog processing step (4, 24) a flank counter (8, 28) counting the flanks of the period length signals is connected, which is reset by a recovered in the analog processing step and to a phase / or amplitude jump assigned switching signal and blocks a storage switching (12, 35) which is arranged to take over the counter indication of the period length counter (6, 25). Coupling device according to Claim 1, characterized in that the edge counter (8, 28) locks the bearing coupling (12, 36) after the reset by means of a coupling signal and releases the bearing coupling (again) for a preselectable number of the periods of the period length signals. 12, 36) to take over the counter statement of the period length calculator (6, 26), after the preselected counter statement has been obtained. Coupling device according to Claim 1 or 2, characterized in that the output of the analog processing stage (4) in an AND gate (14) is connected to the output: the flank counter (8), which is associated with the preselected counter indicator, wherein the storage cup - the line (12) can be trigased over the AND gate (14). Coupling device according to Claim 1 or 2, characterized in that in the case of a tube presence of a frequency threshold stage (20), the coupling signals of which cause a jump, a monostable rocker stage (30) is connected between the output of the frequency threshold stage (20) and the edge flank. (28) reset input and that the input of the threshold stage (20) is triggered over an AND gate (38), in which the output signal of the edge counter (28), which corresponds to the preselected counter indication, and the output signal from the analog processing stage (24) are combined. Coupling device according to Claim 4, characterized in that the rocker stage (30) is connected through both the positive and also negative flanks of the switching signals.