SU1455266A1 - Apparatus for measuring the rigidity index of i.c. engine performance - Google Patents

Abstract

The invention makes it possible to increase the accuracy of engine diagnostics by sending a signal from pressure sensor I simultaneously to two thresholds of element 3 and 4, a signal from which the 1I coincidence circuit and control unit 5 are received. At the same time, the time interval equal to the delay 3 and 4, is filled with high-frequency pulses of the quartz oscillator 16, the coincidence circuit P transmits these signals at the moment when the signals of the logical unit are transmitted to the threshold elements 3 and 4 at the same time Denia pulses from the threshold elements 3 and 4 to the indicator 17 on which is indicated the number whose value corresponds to the coefficient of stiffness of the engine operation. I zp f-ly, 3 ill. with (L

Description

Phage. {

The invention relates to the diagnosis of engine internal combustion engine (two), and can be used to measure the stiffness coefficient of the engine.

The purpose of the invention is to increase the accuracy of diagnosis.

Figure 1 shows a functional block diagram of the device; Fig. 2 is a diagram of the control unit; on fig.Z - timing charts of the individual elements of the device.

The device contains (figure 1) sensor

1. pressure set in the cylinder

2, the first and second threshold elements 3 and 4, the control unit 5 with a pin 6, a second 7 and a third 8 inputs, the first 9 and a second 10 inverters, the first (jxeMy 11 coinciding with the first 12, second S3, third 14 and the fourth 15 inputs, the quartz oscillator 16 and in, - the indicator 17.

The control unit 5 comprises (.2) a photodiode 18, a second coincidence circuit 19, a third coincidence circuit 20 with i second 21 and third 22 inputs, an upper dead center sensor 23 (TDC),

. Button measurement 24, third 25 and fourth 26 inverters.

A pressure sensor 1 measuring the pressure in the cylinder 2 two is connected to the inputs of the first and second thresholds.

 elements 3 and 4 tuned to different levels of tripping voltage. The threshold element 3, which is set to a lower level than the threshold element 4, triggered voltage level, is connected to the first input 6 of the control unit 5, which generates a release signal (logical unit signal), limited in duration by one-to-zero signals from the outputs the first inverter 9 and the second threshold element 4.,

The output of the second threshold element 4 is connected directly to the second input 7 of the control unit 5, to the fourth input 15 of the first circuit 11 to match and through the first inverter

9- with the third input 8 of the control unit 5, the output of which is connected to the third input 14 of the first coincidence circuit 11. The second input 13 of the latter is connected to the crystal oscillator 16. The first input 6 of the control unit 5 is connected to the output of the first threshold

element 3 and through the second inverter

10- with the first input 12 of the first circuit

11 matches, the output of which is connected to the indicator 17.

The led 18 (Fig. 2) is connected to the second coincidence circuit 19, the outputs of which are the first 6 and third 8 outputs of the control unit 5. The TDC sensor 23 is connected to the second input 21 of the third coincidence circuit 20, and the third input 22 is connected to the Measurement 24 button via the first inverter 25. The output of the third coincidence circuit 20 is through the second inverter 26 connected to the third input 14 of the coincidence circuit 11

The device works as follows.

During the combustion of the fuel mixture in the cylinder 2, the pressure changes, which is sensed by the pressure sensor 1. The electrical signal from the output of the pressure sensor 1 simultaneously arrives at the inputs of elements 3 and 4. The time interval, the delayed response of threshold elements 3 and 4, is filled with high-frequency pulses of a quartz oscillator 16 (Fig. 3). The first coincidence circuit 11 skips them while the first 12, third 14, and fourth 15 inputs simultaneously transmit signals of a logical unit.

In the control unit 5, the control for the passage of pulses from the photodiode 18 through the second circuit 19, coincidence. To the third input 14 of the first, the coincidence circuit 11 from the control block 5 is given a logical unit signal if the second input 7 of the control block 5 and the second The 21 and third 22 inputs of the third coincidence circuit 20 also provide the signals of the logical units. To the third input 22 of the third coincidence circuit 20, a signal of a logical unity D.1 is applied when pressing the button Measurement 24 after passing the signal from TDC sensor 23 to the second input 21 of the third coincidence circuit 20.

When the device is operating, a number is displayed on the indicator 17, the value of which corresponds to the stiffness coefficient and engine operation.

Claims (2)

Invention Formula one; An apparatus for measuring the stiffness coefficient of an internal combustion engine comprising a pressure sensor installed in engine cylinder, top dead center sensor and indicator, about tl and h. in order to increasing the accuracy of diagnostics; the device additionally contains the first and second threshold elements, the first and second inverters, a crystal oscillator, the first coincidence circuit and 2. The device according to claim. 1, and the fact that the control unit contains a photodiode, the second with a match, the third circuit is matched with three inputs, the Measure button a control unit, the sensor output is the ω and the third and fourth inverters. pressure is connected to the inputs of the first and; -second threshold elements, the input of the second inverter is connected to the first input of the control unit and the output the photodiode is connected to the second coincidence circuit, the top dead center sensor is connected to the second one in the house of the third coincidence circuit, the first threshold element, and the output - T5 Measurement through the third inverter with the first input of the first circuit is a match. No, the output of the second threshold element is connected to the second input of the control unit, the fourth input of the first coincidence circuit, and through the first inverter to the third input of the control unit whose output is connected to the third input of the first coincidence circuit, the output of the crystal oscillator is connected connected to the third input is the third coincidence circuit connected to the twist inverter, the first input of the three matching circuits is the second 20 inputs of the control unit, two inputs of the second coincidence circuit - the first and the third inputs of the control unit, the output of the fourth inverter - the output of the control unit .. with the second input of the first matching circuit connected to the indicator. 2. The device according to claim. 1, furthermore that the control unit contains a photodiode, a second coincidence circuit, a third coincidence circuit with three inputs, a button. and third and fourth inverters. and third and fourth inverters. the photodiode is connected to the second coincidence circuit, the top dead center sensor is connected to the second input, the house of the third coincidence circuit, the button Measurement through the third inverter connected to the third input of the third matching circuit connected to the fourth inverter, the first input of the third matching circuit is the second 20 input of the control unit, two inputs of the second matching circuit the first and third inputs of the control unit, and the output of the fourth inverter the output of the control unit .. H2.2 Vi Editor I. Casard  Compiled by V.Gorbunov. Tehred M. Didyk Order 7450/51 Circulation 788 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR. 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production Polygraphic Plant, Uzhgorod, st. Project, 4 Fi.Z Proofreader L. Pilipenko Subscription