SU1522241A1 - Device for measuring engine temperature - Google Patents

Abstract

This invention relates to automation. The purpose of the invention is to improve the measurement accuracy — provided by introducing into the signal, determined digitally by register 12, an amendment calculated from the indications of shaper 4 derived from the temperature signal and sensors 2 and 3 turns and density. The numerical correction ΔT = ART ¹ is calculated by the correction calculator 17, the signals to which are received from the ADC 6 via registers 13-15, and the totalizer gives the total temperature signal 16. The device also contains a temperature sensor 1, a switch 5, a generator 8, a counter 9, ring counter 10, interface 11, register 12, functional converter 18, multiplier 19, indicator 20, control block 7. 1 il.

Description

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The image is related to automatics, and can be used to automate automated systems for controlling objects of various designations with industrial work and robotized complexes, as well as for measuring parameters of objects that cannot be directly measured, for example, engine temperature

The purpose of the invention is higher precision than the measure, nor,

The drawing. Shows the proposed device, .-

The device contains temperature sensors 1 engine J engine speed 2, air flow density 3, shaper 4 derived temperature signal 5 switch 5, analog digital converter b, control unit 7 consisting of generator 8, counter 9 and ring counter lOj node 11 conpHKeHi-iH5 registers 12-15, adder 165 calculator 17 corrections, consisting of a functional converter 8 and multiplier 195 to indicator 20,.

Sensors 1–3 are connected to the corresponding inputs of the switch 5; Sensor 1 is additionally connected via a shaper 4 derivative to the corresponding input of switch 5, and the outputs of the latter are connected via interface 11 (operational repeater; to inputs of ADC 6, whose outputs are connected to information inputs 12–15 in Outputs periiCTpoB 14 and 15 can be connected to the corresponding indicators and inputs of the functional converter 18 of the correction calculator 17. The output of the register 13 is connected to the input of the multiplier 19, the calculator 17 5. The output of the multiplier is another input of the cat 16j is connected to the output of the register IZ-j output - to the switch 20, the control inputs of the switch-5 and the reg-isters 12-15 soy, with the corresponding outputs

ring counter 10 block 7, Control

Lueing inputs of the adder 16, the transmitter 17 and AU.n b are connected to the corresponding output FL of the counter, 9 block 7a

Block 7 is designed to emit control signals 10 1 5 5 in the form of pulses to blocks 5 5 6.,. 1 2-1 7 ,,

The calculator 17 is designed to issue a signal for DT diesel scattering at a temperature taking into account the derived signal

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temperature and time constant, that is, it generates a signal in digital form taking into account the inertia of the thermopair and its readings from engine speed and airflow density, and consists of a digital functional converter based on the ROM and a multiplier and realizes the dependence

4T a-Gt,

where C is the corrected value of the constant time;

t is the value of the derivative of the temperature signal, C / cj

a - coefficient

J The time constant of the temperature signal depends on the speed and density of the air flow. Airspeed is proportional to speed.

In general terms (njp),

An increase in the number of revolutions n and an increase in the flux density p leads to a decrease in the time constant. This dependence is determined experimentally and is introduced either in a tabular way, graphically.

The digital multiplier multiplies a constant time signal by a derivative signal.

The device works as follows.

The signal about temperature from sensor 1 and amplifier (not shown) from driver 4 and from sensors 2 and 3 after amplification goes to the corresponding inputs of cog-mutator 5. The latter is controlled keys activated by pulse signals from ring counter 10,

The signals amplified by node 11 are fed to the input of an analog-to-digital converter b (ADC), where they are converted into digital: the j form and then the registers 12-15. where are memorized.

The signals of the registers 14 and 15 are fed to the functional Converter 18 of the transmitter 17 which produces the definition of the function (njp). Signals il. f (njp); And the signal from register 13 (the signal of the temperature derivative) goes to multiplier 19, which calculates the correction uT afT i

The signal LT to the signal of the T-f-fi circuit from the register 12 is sent to the adder 16, which, by a signal from the counter 9 of the block 7, produces the corrected signal of the temperature of truths indicator 20.

Thus, in comparison with the prototype, the reliability of the temperature signal measurement is improved due to the introduction of an amendment that takes into account the influence of a number of factors on the temperature sensor readings.

Claims (1)

Invention Formula A device for measuring engine temperature, containing a switch control unit, an analog-to-digital converter whose output is connected to information inputs of the first, second and third registers, the synchronization inputs of which are connected to the first output of the control unit, the second and third outputs of which are connected to the control input the switch and the analog-to-digital converter synchronization input, respectively, the first, second and third information inputs of the switch are respectively the values of The temperature of the engine, engine speed and air density ustroyst- flow wa, about tlichayuschees in that 0 5 0 5 0 in order to improve measurement accuracy, a shaper of the temperature derivative, a fourth register, an adder and a correction calculator are entered into it, the switch output is connected to the information input of the analog-digital converter, the first output of the control unit is connected to the synchronization input of the fourth register, the output of which is connected to the first . the information input of the adder, the second information input of which is connected to the output of the correction calculator, the first, second and third information inputs of the correction calculator are connected to the outputs of the first, second and third registers, and the fourth and fifth outputs of the control block are the connection of the synchronizer inputs of the adder and calculator amendments respectively, the cyMMafopa output is in-. The information output of the device is located, the output of the analog-digital transmitter is connected to the information input of the fourth register, the input of the temperature value of the device's motor is connected via the driver of the derived temperature signal to the fourth information input of the switch;