SU1420430A1 - Device for registering heat emission curve in piston machine cylinder - Google Patents

Abstract

The invention allows to improve the accuracy and expand the functionality of the device. The device contains a test. My engine 1, pressure sensor 2, amplifier E; differentiating chains 4–13, multiplying circuits 5, 7, 12, 14, 16, and 20, automatic potentiometer 6, generator 8, functional switch /; ; :,. l piston, poteptsio 1et | 1 11. with -. :, unit 15, OSSP, 1L (;; | (;; 7. e.h i g, ii.-i, iii key 18, gauge 19); (:: (valve, gauge 21 Ti) i-.i. L 1 1 c o ;;;;; 1Ny nsi generation unit 22 nsi: ppy,: -., Hhs; ato.- | adiabats and transform unit 23. In b. Calculation is made for P1.1 of adiabatic K. The signal, proportional to A, is fed from the output of block 22 to the circuit 14 directly, and on the board 16, via item 23, where the signal is converted to 1 / ( L-I). The signal, which arrives at the input of the chain 13, is differentiated, multiplied in scheme 5 by the value of gas pressure in cylinder P and scheme 14 by value L, and then it enters the input of block 15. The signal from the circuit 12 also arrives at the input of the latter. After summing the signals and multiplying by 1 / (L - 1) in the circuit 16, the oscilloscope receives a signal that records the curve curve. .I il. (L

Description

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The invention relates to devices for testing piston machines, in particular for recording the heat generation curve in a cylinder of a piston machine.

The purpose of the invention is to improve the accuracy and enhance the functionality of the device.

The drawing shows a block diagram of the device.

; The device contains a test motor 1, a pressure sensor 2, an amplifier 3, a differential chain 4, a second multiplying circuit 5, an automatic potentiometer 6, a fifth multiplying circuit 7, a heprator 8, a functional generator: ator 9 of a piston position, the first 10 and the second 11 potentiometers, the first multiplying circuit 12, the second differentiating chain 13, the third multiplying with heme 14, the summing unit 15, the fourth and multiplying circuit 16, the oscilloscope 17, the electronic switch 18, the sensor 19 for the E start | | valve, multiplied by multiplying the circuit 20 d A temperature sensor 21, an adiabatic index value generation functional unit 22, and a conversion unit 23.

When the engine under test 1 is operated, the pressure sensor 2 installed on the engine cylinder produces an electrical signal that is amplified in amplifier 3 and fed to the first differential circuit 4, the second multiplier circuit 5 and through the automatic potentiometer 6 to the input of the fifth multiplier circuit 7. A generator 8 is rigidly connected to the engine shaft, generating a signal in the form of siiiq., Which is supplied to the function generator generator 9 by the piston position, the output of which through the first thermometer 10 is connected to the inputs of the first multiplier Our circuit 12 and the second differentiating chain 13, and through the second potetsiometr 11 - with the fifth non-multiply circuit 7. The output of the second chain 13 via the second multiplying circuit 5 is connected to the input of the third multiplying circuit 14. The signal from the first differentiating chain 4 is supplied. The outputs of multiplying circuits 12 and 14 are connected to summing unit 15, which in turn is connected to oscilloscope 17 via fourth multiplying circuit 16 to oscilloscope 17. Automatic potentiometer setpoint 6 is connected to input of amplifier 3. onny key 18, a control input coupled to the position sensor 19 of the intake valve. The output of the fifth multiplying circuit 7 is connected to the input of the sixth power supply circuit of circuit 20, the second input of which is associated with the temperature sensor 21 in the intake manifold, and the output of the sixth power supply circuit, its circuit 20 (which is the home of the device for recording instantaneous temperature values in the cylinder) -

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with the functional block 22 of generating the adiabatic index value. The output of the adiabatic index generation function block 22 is connected to the third multiplying circuit 14 directly and to the fourth multiplying circuit 16 via the adiabatic index conversion block 23.

The device works as follows.

The gas pressure signal (P) in the cylinder of the engine 1 is converted by the pressure sensor 2 into an electrical analog, which is amplified in amplifier 3 and fed to the input of the first differentiating chain 4, to the input of the second multiplying circuit 5 and to the input of the automatic potentiometer 6. At the same time, the signal generator 8 is proportional function z1pf sends a signal to the input of the functional generator 9 of the piston position, in which the formation of a signal corresponding to the function and

 -.BUT. ,,. Y

K-1 CF

from pottoptsiometrov 10 and 11 to the input of the first multiplying circuit 12 and to the input of the second differentiating chain 13 receives a signal corresponding to the function

VhfK + dsimp K,. x

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2 e-1 Sf

and the input of the 7th multiply circuit 7 is the signal corresponding to the function

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At the moment of closing the intake valve (start of compression), the sensor 19 of the position of the intake valve sends a control signal to the electronic switch 18, closing it for a short time. At this moment, an electrical signal proportional to the pressure at the beginning of compression Ra, from the output of amplifier 3 passes through an electronic switch 18 and enters the input of the setpoint of the automatic potentiometer 6, from the output of which the signal proportional to the P / Pa ratio is fed to the input of the fifth multiplying circuit 7 from the output of which a signal corresponding to the function is fed to the input of the scatter multiplying circuit 20

 ipl (Hi-l. + f si.p) / лЛ2е e-1 di.f

The second input of the sixth multiplying circuit 20 contains a signal proportional to the temperature (ha) at the beginning of the compression stroke from the sensor 21 of the temperature in the intake manifold. At the output of the sixth multiplying circuit 20, we obtain a signal that is fundamental to the temperature in the cylinder of the engine, i.e. corresponding to the function

-g P fe-Ve + l 51pf. To gp () i. which is fed to block 22.

d (f per input functional

In the functional block 22 of generating the adiabatic index value, the adiabatic index / C is calculated.

A signal proportional to the value of K is fed from the output of the adiabatic index generation function block 22 to the third multiplying circuit 14 directly and to the fourth multiplying circuit 16 through the adiabatic index conversion block 23, where the signal is converted to 1 / ().

The signal arriving at the input of the second differentiating chain 13 is differentiated, multiplied in the second multiplying circuit 5 by the value of P and in the third multiplying circuit 14 by the value of K, and then fed to the input of the summing unit 15 in the form of KPdV / d (f.

The input of the summing unit 15 also receives a signal from the first multiplying circuit 12 in the form of VdP / d (f.

After summing the signals and multiplying by 1 / (K. - 1) in the fourth multiplying circuit 16, the input of the oscilloscope 17 receives a signal corresponding to the function

(W, V d d (f

which is used to record the heat generation curve.

The use of the device increases the accuracy of measurements, which allows an increase in the accuracy of the adjustment of the combustion process and, consequently, more efficient engine efficiency and lower fuel consumption, along with the acceleration of new engine models and the improvement of engine development processes.

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Claims (1)

Claims An apparatus for detecting a heat generation curve in a cylinder of a piston machine comprising a pressure sensor, a plug, a first and second differentiating foam, a first and second multiplying circuit, a summing unit, and automatic cells; potentiometer, oscilloscope and funk11:; alyyy | piston position generator, pr.chsm: ia i- pressure tick through usi.shte.pb regiment. It is connected to the first multiplying circuit through the first differentiating chain and to the second multiplying scheme directly, the summing unit is connected in parallel with the second and first multiplying circuits, the oscilloscope is connected to the output of the adding unit, the functional generator through the testiometer is connected to the first multiplying circuit and the second differentialing chain The output of which is connected to the input of the second multiplying circuit, characterized in that, in order to improve the accuracy, the device additionally contains a generation functional block values of the adiabatic exponent, the conversion unit of the indicator, the l adiabat, the third, fourth, fifth and fourth multiplication circuit, the input of the generation functional unit connected to the output of the sixth multiplying circuit, and the output to the conversion unit and the third multiplying circuit connected to a second multiplying circuit and a summing unit connected to the oscilloscope through a fourth multiplying circuit to which the conversion unit is connected, the inputs of the fifth multiplying circuit are connected to an automatic potentiometer and functional- generator, and the output - to the sixth multiplying circuit.