SU534859A1 - Pulse selector for engine speed recorder - Google Patents

Description

The invention relates to a pulse technique.

A pulse selector is known for a device for registering the engine speed, which contains sensors and two flip-flops, at the entrance: which receives pulses. Triggers are dropped by clock pulses. From their outputs, the pulses through the inhibitor circuits go to the reversible counter. As a buffer element, the selector includes the shift register 1.

This selector does not provide sufficient accuracy.

Closest to the proposed pulse selector for an engine speed register device comprising a series-connected speed sensor, a pulse shaper, a trigger and a differentiating element, the output of which is connected to one of the inputs of the AND logic element, and the speed measurement unit consisting of a control unit, a converter time interval in digital code and output block 2.

This selector does not have sufficient accuracy.

The purpose of the invention is to improve the accuracy by the fact that the pulse selector, which contains successively connected 1 turns of speed, pulse shaper, trigger and differentiating element, the output of which is connected to one of the inputs of the logic element And, and the measuring unit of turns, consisting of control unit, transducer the time interval in the digital code and the output block, three additional triggers with a counting input are inserted, connected in series with each other ;, and the installation inputs are additional trigger a connected to the output of the control unit, the first count input of the additional flip-flops connected to the output of the AND gate, a second input coupled to an output of the last of the additional triggers and the corresponding output of the second flip-flop is connected with an additional input transducer time interval into a digital code. The structural electrical circuit for the inventory of the selector is shown in the drawing. The selector includes a speed sensor 1, a pulse shaper 2, a trigger 3, a differentiating element 4, a logical element AND 5, a speed measurement unit 6, which includes a control unit 7j time converter in digital code 8 and an output block 9; three triggers 10-12 with a counting input. The output signal is removed from output 13. The principle of operation of the device described is as follows. I The signal from the rotational speed sensor in the form of a sinusoidal voltage, the next period is costly proportional to the number of revolutions of the two, is fed to the imaging unit 2, where it is converted into positive pulse with a subsequent period corresponding to the period of the input signal. From here, the impulses of the positive polarity act on the trigger (for example, the Schmidt trigger) | 3 ,. where converted to positive: rectangular pulses. From trigger 3, the terminal pulses differentiated by laneMeHTOM 4 are fed to one of the inputs of the igneer terminal 5, the initial installation of the trigger 1012 occurs on a signal from the control unit. NIN 7, The corresponding state of the triggers 10-12 allows trigger 12 to send a signal to the logic element AND 5, allowing the pulses to pass from differentiating element 4, Element output. And 5 is co-connected with the counting input of trigger 1O. triggers 1O-12 change state. From trigger 11, a signal is output to converter 8. | After the arrival of the second and myca triggers, the Yu-12 transitions to the next state. When the third pulse arrives, the state of the 1O-12 triggers changes again. In this case, the passage of pulses through an AND 5 logic element and the output of a signal from Tpsirropa 11 to the converter 8 is stopped. Consequently, from the trigger 11, a snipe-; The signal is measured, the duration of which is equal to the duration of two periods of the & code signal, which provides an increase in the accuracy of measurement of turns. In addition, a signal is sent to block 7 from trigger 12. In the converter 8, the interval specified by the signal from trigger 11 is converted into a parallel binary code, from trigger 12 starts block 7, which controls the operation of the speed measurement unit 6, to act on converter 8 and 9 Upon completion of the measurement of speed, the unit 7 El-j signal is set for the installation of flip-flops 10-12 into the idle state. The selection cycle of the two, the gain of the input signal is repeated. The selection of two periods of the input signal is also explained by the fact that the sensors (DTE rotations generate alternating voltage, the periods of which are different due to the asymmetry of the sensor rotor ;; Thus, the error due to the sensor rotor asymmetry is eliminated. Invention formula A pulse selector for a device for rectifying the engine speed, containing a series of sensor I turns, a pulse driver, a trigger and a differentiating element whose output is connected to one of the logic inputs And, and the speed measurement unit, consisting of the control unit, the time interval converter into a digital code, and the output: with each other, the installation inputs of additional triggers are connected to the output of the control unit, the counting input of the first of the additional triggers is connected b by the code of the AND logical gate, the second inlet of which is connected to the output of the additional itelnyh triggers a corresponding further second output connected to the input transducer time interval into a digital code. Sources of information taken into account during the examination: 1. Patent of Germany No. 1191858, cl. , 21 a36 / 22, 23.12.65. 2. Auth. St. USSR N9 291328, class, KOZ K 5/04, 18.02.71.

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