SU1359703A1 - Device for measuring temperature in piston machine cylinder - Google Patents

Abstract

The invention improves the accuracy of measuring t-ry. The device contains an engine cylinder 1, a pressure sensor 2, an amplifier 3, automatic potentiometers (AP) 4.8, multiplying devices 5.9, 6 (function generator with Sod), a piston position function generator 7, an intake manifold 10, registering device I, electronic switches 12, 13, sensor 14 of the position of the intake valve 15. The signal for the pressure of gas in the cylinder is applied to the AP 4. At the same time, the generator .6 sends a signal to the input of the function generator 7 and to the input of the AP 8. At the time of the start of compression the sensor 14 sends a signal to the electronic keys 12 and 13, the circuit x for a short time. Passing through the circuit, the signal from VY7, Ail 4 and 8 moves to the first and second inputs of device 5. From the output of the last, the received signal is fed to the input of device 9, to the second input of which a signal is proportional to t-re at the beginning of compression From the sensor of a gas t-ry in the collector 10. From the output of the device 9, the signal goes to the input of the device 11. 3 sludge. CO i2 F | N Yu 15 with SD with .f

Description

ten

sixteen

20

11359703

The invention relates to machine building and can be used in testing piston machines to limit the temperature in their cylinders.

The goal. the invention is to increase accuracy.

In FIG. 1 shows a block diagram of the device; in fig. 2 — graphs that affect the values of the temperature measurement in the cylinder caused by not taking into account the magnitude of the actual degree of compression and the actual angle of onset of compression; in fig. Figure 3 shows the curves describing the difference in gas temperature in a cylinder with deviations of the initial compression angle from the normal one.

The device contains a cylinder 1 of a motor body with a pressure sensor 2 mounted on it, an amplifier 3 connected via potentiometer 4 to a first multiplying device 5. A device 6 (function generator) connected to the input of a function generator is rigidly connected to the motor shaft piston 7, consisting of known integrated circuits on operational amplifiers. The functional generator 6 is connected via the second automatic potentiometer 8 to the second input of the first multiplying device 5. The output of the first multiplying device 5 is connected with the input of the second multiplying device 9. The second input of the second multiplying device is connected to an inlet temperature sensor the collector 10. The output of the second multiplying device 9 is associated with a recording device 11 (for example, an oscilloscope). The unit of the first automatic potentiometer 4 is connected to the output amplifier 3 via the first electronic key 12, and the unit of the second automatic potentiometer 8 is connected to the output of the function generator of the piston 7 position via the second electronic key 13. The controllers of the first 12 and second 13 electronic keys are connected to the sensor 1.4 position of the intake valve 15.

The device works as follows.

25 to

45 h h

thirty

35

40

50

55

The gas pressure signal in cylinder 1 is converted by sensor 2 into an electrical analog, which is amplified in

6

0

the amplifier 3 and enters the input of the automatic potentiometer 4; Simultaneously, the generator 6 sends a signal to the input of the function of the generator of the piston 7 position, from where the signal enters the input of the second automatic potentiometer 8. At the moment of closing the intake valve 15 (start of compression) The valve provides a control signal to the electronic switches 12 and 13, closing them for a short time. At this moment, the electrical signal from the output of amplifier 3 passes through the first electronic key .12 and enters the input of the setpoint of the first automatic potentiometer 4, and the electrical signal from the output of the generator of the piston 7 position passes through the second electronic key 13 and enters the input of the setpoint of the second automatic potentiometer 8. The signal from amplifier 3 is divided in the first automatic potentiometer 4 by an amount proportional to a given PCU signal constant for the time of one cycle (until the next compression), and the signal about The generator of the position of the piston 7 is divided in the second automatic potentiometer 8 by an amount proportional to a given signal, also constant by the time of one cycle. From the output of the first automatic potentiometer 4, a signal proportional to the pressure ratio is fed to the first input of the first multiplying device 5, and from the output of the second automatic potentiometer 8, the signal goes to the second input of the first multiplying device 5. At the output of the first multiplying device 5, which is fed to the input of the second variable 5 of the device 9. The second input of the second multiplying device 9 is given a signal proportional to the temperature at the beginning of compression, from the sensor eratury gas into the intake manifold 10. At the outlet of the second multiplying device 9 is obtained a signal which is supplied to the input 11 of the recording device.

0

five

0

0

55

Claims (1)

Invention Formula A device for measuring the temperature in the cylinder of a piston machine, comprising a pressure sensor in the cylinder, an amplifier, an automatic potentiometer, the first and second multiplying devices, a functional piston position generator, an intake valve position sensor, an electronic switch, a gas temperature sensor in the intake manifold and a recording device, the pressure sensor being connected to the input of the first multiplying device, through an amplifier and an automatic potentiometer, a function generator of the piston position the second input of the first multiplying device; the inlet valve position sensor is connected to the control input of the electronic switch, the second input of which is connected to the amplifier output, and the output to the control switch input automatic potentiometer, 20 multiplying device through gas inlet sensor in the second the collector is connected to the input by a second meter. NMT 200 Z20 then 260 280 t 320 S60 380 420 UO P, e / 3, f7.H.S. FIG. Z a multiplying device whose output is connected to a recording device, and a second input to an output of a first multiplying device, characterized in that, in order to ensure accuracy, the device further comprises a second electronic key and a second automatic potentiometer, and the control input of the second electronic key is connected with the intake valve position sensor, its second input is connected to the function generator output-- the piston position, and the output is connected to the control input of the second automatic potential meters, and the position of the piston functional generator is connected to the second input of the first automatic potential;: U. about NMT 200 220 260 280 30ff 320 5 "/ 7 J60 380 00 gl / .§ :. (ig. J