SU684574A1 - Arrangement for monitoring and registering the working parameters of vehicles - Google Patents

Description

(54) DEVICE FOR THE CONTROL AND REGISTRATION OF THE INDICATORS OF VEHICLE OPERATIONS

The purpose of the invention is to improve the accuracy of the device.

The goal is achieved by the fact that a fixed-generator 1 is inserted into the device. frequency generator, reference signal generator, switch, signal analyzer and control unit. The output of the generator of fixed frequencies is connected via the driver of the reference signals to the second inputs of the measuring units, the third inputs and the first outputs of which are connected respectively to the outputs and inputs of the etching unit. The second outputs of the measuring bays are connected via a switch to the input of the signal analyzer.

Each measuring unit contains a strain amplifier, an overload unit, time rectifier and frequency channels, the inputs of which are connected to the output of the strain amplifier and the overload unit. Each frequency channel 1 contains series-connected band-pass filters, amplifiers, detectors, quadrs, transducers (voltage-frequency, I element, dec) pulse impulse, power amplifier and counter, pulse detector output, power amplifier and counter, output. The detector of each channel is connected to the input of the overload unit, the second section of the switch is connected to the output of the time relay. B. The input of the voltage amplifiers, the inputs of the frequency channels, the input of the time relay and the outputs of the meters are respectively connected with the first, second and third inputs and output of the measuring unit.

FIG. I presents a structural electrical system diagram. We monitor and record vehicle performance data; on (Fig. 2 shows a structural diagram of one of the variations (GGM of a multichannel measuring instrument; Fig. 3 shows plots of voltages of a generator of fixed frequencies and a generator of reference signals, B1 of full minimum dynamic calibration of the device.

The device (Fig. 1) contains three sensors 1, three of the measuring unit 2, block 3 of the P1Y control, a generator of 4 fixed frequencies, a driver 5 of the reference signals, a switch b, and a signal analyzer 7. Switch 6 has three inputs 8-10 and a common output, with the generator 4 output being connected to the input of the grouser 5, each measuring unit 2 one m from your outputs connected via switch 6 to the input of the signal analyzer 7, the other to the input of the control unit 3, the three outputs of which are connected to the control inputs of the measuring units 2, the information input of each of which is connected to its sensor 1, and the calibration input - with the corresponding output of the reference signal generator 5.

Sensor 1 converts the mechanical value (acceleration, speed / deformation, etc.) of the components and parts of the transport vehicle into an electrical signal. Measuring device 2 amplifies this signal at the carrier frequency, filters, converts and processes it in five frequency (octave) channels with average geometric metrics of 1, 2, 4, 8 and 16 Hz, as well as recording the result from. Measurement in each channel to your electro.mechanical counter.

Each measuring device (Fig. 2) includes a strainer 11, the input of which is connected to the sensor 1, and the output - to the inputs of five frequency channels and with a common non-load indicator 12. Each frequency channel contains a band-pass connected in series with each other ( octave filter 13, tuned to its frequency band. Amplify 1. 14. Detector 15, quad 16, inverter converter ---- frequency 17, element 18 and 18. analyze; P) and pulses 19, power amplifier 20 and counter 2i. In addition, the detector 15 its.m. output is connected to the indicator. ne) ezgruzkp 22. Pe; ie, time 23 by input 24 is connected to the main control. the time output is connected to the second inputs of the elements and 18 frequency channels. The output of each band-pass filter 13 is connected to terminal 26, and the number 27 denotes the auxiliary input of the measuring unit.

The control unit 3 is designed to tie the measuring units 2 to a single origin, to balance them, to set "zeros" and to control the supply voltages.

The dynamic calibration unit generates an electrical signal, which coincides in form with the voltage meter, obtained at the output of the strain amplifier II (FIG. 3) during operation. It consists of a generator generating einusoidal oscillations with fixed frequencies (signal 25, fig. 3) at 1, 2, 4, 8, and 16 Hz, and a generator of a reference signal, generating a reference signal (signal 26, fig. 3). The output of the driver is connected to the calibration input of each measuring unit. The use of a dynamic calibration block makes it possible to increase the measurement accuracy by taking into account all the factors that influence the transfer characteristic of the instrument measuring paths.

Analyzer 7 electrical signals

designed to analyze the studied electrical signals and measure their parameters. It consists of a discrete

oscilloscope and. devices for measuring the differential distribution law.

The device works as follows. When the vehicle is moving, the sensors 1 generate electrical signals, the amplitude of which varies depending on the change in the measured value. These signals are sent to the measuring units 2, in each of which (Fig. 2), the signal is fed to the tensor amplifier 11. This signal is amplified by the tensor amplifier 11 at the carrier frequency, demodulated by them, and fed to band-pass filters 13 tuned to the corresponding octave bands. The useful signals selected by bandpass filters are amplified at the carrier frequency ycVi by 14 and fed to the detectors 15. Full-wave rectifiers are used as detectors. The rectified signals from the detectors 15 are sent to quadrants 16 (varistors with a quadratic volt-ampere characteristic), and then voltage-frequency converters 17. At the output of the converters, a pulse sequence is formed, the pulse frequency of which varies in accordance with the signal amplitude at their entrances. These pulses pass through AND 18 elements (in the presence of a permit potential with time relay 23) to the inputs of the pulse expanders 13. The expanded pulses are further amplified by the power amplifier 20 and are counted by the counter 21 in the decimal number system. Timer 23 determines the duration of the measurement. In addition, signals. With a tensioamplifier 11 and from the detector 15 are fed to overload indicators 12 and 22, whose response thresholds are selected in accordance with the dynamic amplitude ranges of the tensioamplifier and frequency channels. When the overload threshold is triggered, the corresponding LED indicates an overload.

Measurement results are recorded on counters 21 in the decimal number system. The registered numbers are proportional to the integral of the square of the value of the measured parameter in a given frequency channel, - z /. i

NI Kt j, where N (is the i-th meter readings; KL is the calibration factor; T is the measurement time; xi (t) is a measurable parameter.

In total, the readings of the meters 21 of the measuring unit 2 characterize the qualitative distribution of energy (power spectrum) of the parameter under study in the frequency octave bands with geometric average frequencies of 1, 2, 4, 8 and 16 hp.

Works calibration device as follows. The voltage of one of the fixed frequencies (1, 2, 4, 8 or 16 Hz) from the generator 4 sinusoidal oscillations is fed to the shaper 5 of the reference signals, which produces square impulses of the type square wave without a constant component. The amplitude of these pulses is proportional to the amplitude of the input sinusoidal signal, and the voltage phase 26 (Fig. 3) changes abruptly by 180 when the sinusoid passes through zero. The amplitude of the signal at the output of the imaging unit 5 is controlled by varying the amplitude of the sinusoidal signal of the generator 4. By knowing the sensitivity of the sensor 1 used, it is possible to scale the values of the reference signal in units of the parameter being measured, which allows the measuring units 2 to be tared.

Calibration of the measuring units 2 is performed after a working run, with the same gain. She concludes

0 in specifying a series of amplitude values of the calibration signal at the input of a multichannel device and reading the readings of the counters 21 corresponding to these amplitudes. Calibration can be carried out in full when the calibration characteristic is taken over the entire dynamic range for each of the five channels of the measuring unit, or in a partial volume when the calibration curve is plotted in a limited range of dynamic range by several points. In this case, the transfer characteristic of each channel of the measuring unit does not necessarily have to pass through the origin.

Usually there is no need to remove the full calibration characteristic over the entire dynamic range of amplitudes. It is enough to remove a section of the characteristic in the area of working amplitudes. In this case, the operator sets on the generator 4 sinusoidal oscillations one of the fixed frequencies (for example, 1 Hz), sets the value of the amplitude of the reference signal, turns on the measuring unit 2 for a time equal to the working time, and reads the counter on the counter 21. Over 5 Giving several values of the amplitudes of the reference signal, a number of samples are obtained on the counter 21. Based on these data, a section of the calibration curve is constructed. Using this curve, and the count obtained during the working run for the same frequency range

in (1 Hz), the value of the measured physical quantity is determined. Similarly, it is done when taking a calibration curve and determining the measurement result for the remaining frequency channels.

The signal analyzer 7 makes it possible to extend the capabilities of such systems to study the processes in the parts and assemblies of transport vehicles. Using the switch

6 oil can be connected to 8, 9. and 10 measuring units. In the analyzer, the 7 sial first goes to the oscilloscope. Observing it on the screen, the selector selects such an enhancement in order to combine the dynamic dianase of the C11G under study, 1a with the ycT dynamic range) () iicTKa to measure the differential distribution law, and then 1Us with the next to the analyzer input. The end of the measurement process is signaled by a LED: when on the screen, the octal | --raf is displayed as points of the curve, the differential law is distributed.

The economic effect from the use of the proposed device is due to

BbiHie by its technical specifications.

Claims (2)

1. A device for monitoring and recording the performance indicators of vehicles, including sensors whose outputs are connected to the first inputs of measuring units, characterized in that, in order to increase the accuracy of the device, a fixed frequency generator has been entered into it (the normalizer of reference signals, a switch, an analyzer signals and the control unit, the output of the generator of fixed frequencies is connected through the driver of these dynamic signals to the second inputs of the measuring units, the third inputs and the first outputs of which are connected Here, respectively, with the outputs and inputs of the control unit, the second outputs of the measuring units are connected via a switch to the input of the signal analyzer. 2. Device n. 1, characterized in that each measuring unit contains strain amplifiers, an overload unit, a time relay and five frequency channels, the inputs of which are connected to the output of the tensoamplifier And an overload unit, each frequency channel contains series-connected band-pass filter, amplifier, detector, quadr , voltage-to-frequency converter, And element, pulse expander, power amplifier and counter, detector output of each channel is connected to the input of the overload unit, second input element AND of each channel is connected to the output of the time relay, the input of the strain amplifier, the inputs of the frequency channels, the input of the time relay and the outputs of the counter are connected respectively to the nerves, the second, third inputs and outputs of the measuring unit. Sources, informations taken into consideration during examination 1. Wilpert KI, et al. Some questions of the statistical analysis of the oscillations of a car, “Automotive Industry and Man 4, 1965. 2. Forward number 2347609 / 18-24, G 07 C 5/10, 12.04.76, according to which a decision was made to issue the author's certificate. 25 and 26