SU1444634A1 - Device for diagnostics of internal combustion engine - Google Patents

Abstract

The invention allows to expand the functionality and improve the accuracy of diagnosing the device by introducing a mode of measuring the duration of fuel injection and the purity of rotation of the crankshaft while simultaneously measuring these parameters over several cycles of engine operation. Sensor output 1 of the injection process is connected to the input of the imager (F) 3, the output of which is connected to the first input of the key 12, the second input connected to the trigger output (T) 13, and the output to the first input of the switch (K) 19 and C input T 14. The R input T 14 is connected to the output F 4, and the output to the second input K 19, which is connected to

Description

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with:

iih 1 GD 00 Ni

the entrance of a device. The output K 19 is connected to the second input of the exception circuit 22, With the input T 15 and the first input of the coincidence circuit 33, the second input is connected to the output T 17, and the output is connected to the second input of the combining circuit 36 and through F 30 with S- the decoder input 39. The output of the decoder 39 is connected to an indicator 11, and to its S input is the first input of the combining circuit 38 and the R input T 17, the C input connected to the inverse output T 15, the direct output connected to the second input the matching circuit 24 and the first input of the matching circuit 25. The D input T 15 is connected to the inverse output T 16 and the C input T 18, and the R input T 15 is connected to ohm T 16, R-input of divider 28 and the output of the 20th, the third input communication invention relates to the engine structure and can be used for testing and diagnosing internal combustion engines, in particular diesel fuel-injection equipment.

The purpose of the invention is to expand the functionality and improve the accuracy of diagnostics by introducing the mode of measuring the duration of fuel injection and rotational speed of the crankshaft while simultaneously measuring these parameters over several engine cycles

Figure 1 shows the structural diagram of the device; figure 2 - the waveform at the outputs of the individual elements: a - the first driver, b - the sixth driver, in - the first trigger, d - the second driver, d - the first switch, e - the third trigger, w - the second switch, 3 - scheme exclude, and - the first merge scheme, k - the fourth trigger, l - the first coincidence circuit, m - the third driver, n - the sixth trigger.

A device for diagnosing internal combustion engines comprises a sensor 1 of the injection process and a sensor 2 of the upper dead point persed to the entrance to the devices and to the third input K 21. The first and second inputs K 20 are connected respectively. with the first and second outputs of divider 28, the C input of which is connected to the output of circuit 22 and the first input of circuit 2.4, the output connected to the first input of circuit 36. The third input of circuit 36 is connected to the direct output T 18 and R input T 13 and the output with the first input of the circuit 27, coincident and through F 31 with the D input of the buffer register 35 and the input F 32, Output F 32 is connected to the R input of the divider 9, the C input connected to the output of the combining circuit 37, and the output is a C-input of register 35, the output of which is connected to the second input of the comparison circuit 10. 2 lui.

ten

15

The third and second formers, the r-e generator 5, the first to the fourth dividers 6–9, the comparison circuit 10 and the first indicator 11. In this case, the sensors 1 and 2 of the injection process and the upper dead point are connected respectively with the first 3 and the second 4 generator, the generator 5 is connected to the first divider 6, the second divider 7 is connected via the first input of the comparison circuit 10 to the C input of the third divider 8 and the R input of the second divider 7.

The device is additionally equipped with a key 12, the first with sixth triggers 13-18, the first with the third switches 19-21, the exception circuit 22, the first with the five matching circuits 23-27, the fifth 28 and the sixth with 29 splitters, and the third with the seventh formers 30-34, buffer register 35,

 the first to the third combination circuits 36-38, the first 39 and the second 40 decoders 25 and the second indicator 41. The output of the first driver 3 is connected to the first input of the key 12, the second, the input connected to the output of the first trigger 13, and the output from the first the input of the first switch 19 and the C-input of the second trigger 14, the R-input of which is connected to the output

20

the second driver 4, and the output with the second input of the first switch 19 connected to the input A of the device. The output of the first switch 19 is connected to the second input of the exception circuit 22, the C input of the third, trigger 15 and the first input of the first coincidence circuit 23, the second input of which is connected to the output of the fifth trigger 17, and the output to the second input of the first combining circuit 36 and through the third shaper 30 with the S input of the first decoder 39, to the output of which the first indicator 11 is connected, the first input of the third combining circuit 38 and the R input of the fifth trigger 17, the C input connected to the inverse output of the third trigger 15, direct

the output of which is connected to the second input-20 of the trigger 13, the R input of the sixth trigger of the second matching circuit 24 and pergera 18 and the S input of the second decoder 40, the output of which is connected to the second indicator 41, and the C input of the third input matching schemes 25. The D-input of the third trigger 15 is connected to the inverse output of the fourth trigger 16 and the C-input of the sixth trigger 18, and the R input of the third trigger 15 to the input of the fourth trigger 16, R-input of the fifth splitter 28 and the output of the second switch 20, the third input connected to the device input B and the third input of the third switch 21. The first and second inputs of the second switch 20 are connected respectively to the first and second outputs of the fifth divider 28, the C input of which is connected to the output of the exception circuit 22 and the first input of the second circuit 24 match, out house connected to the first entrance of the first

25

thirty

35

It is connected to the C input of the first decoder 39 and to the output of the third divider 8, the R input of which is connected to the output of the seventh shaper 34, the input connected to the output of the third combination circuit 38.

The measurement algorithms for the diagnosed parameters of the proposed device are as follows.

When measuring the duration or angle of fuel injection advance, the duration of the process pulses is compared with their period. For this, when measuring in one cycle of engine operation, the time interval between two pulses of the combined circuit 36, the third input of the process, i.e. their period of time, which is connected to the direct output of the neck, is filled with a frequency of f / 720. The half-burnt trigger 18 and the R input of the first trigger 13, and the output with the first input of the fifth circuit 27 coincide and, through the quarter driver 31, with the D-BXO- house of the buffer register 35 and the input of the fifth former 32, the output of which is connected to R-input of the fourth divider, 9, C-input of the second combining circuit 37 connected to the code, and output with the C-input of the buffer register 35, the output of which is connected to the second input of the comparison circuit 10. The output of the fifth coincidence circuit 27 is connected to the C input of the second divider 7, and its second input is connected to the input of the first divide 6, the first output of which is connected to the second input of the third coincidence circuit 25, you

hodpk; a connection with the nepubiNt input BTopoi i of the combination circuit 37, the second input of which is connected to the Output of the fourth coincidence circuit 26, the first input of which is connected to the direct output of the fourth trigger 16, and the second to the output of the third switch 21. The first and second inputs of the third switch 21 are connected respectively, with the third and fourth outputs of the first divider 6, the second output of which is connected to the C-input of the sixth divider 29, the R-input connected to the inverse of the jack. the sixth flip-flop 18, and B: 5th trip. DHg shaper 33 — with the third input of the third combining circuit 38, the first input of the exclusion circuit 22, the S input of the first

It is connected to the C input of the first decoder 39 and to the output of the third divider 8, the R input of which is connected to the output of the seventh shaper 34, the input connected to the output of the third combination circuit 38.

The measurement algorithms for the diagnosed parameters of the proposed device are as follows.

When measuring the duration or angle of advance fuel injection, a comparison is made between the duration of the process pulses and the period they follow. To do this, when measuring over a single cycle of engine operation, the time interval between two pulses, the number of pulses that has been tested and is represented as a binary equivalent, is fed to one of the inputs of the binary number comparison circuit.

Then the process impulse, equivalent to the duration or advance injection angle, is filled at a frequency f and the resulting number of pulses, also in binary form, is fed to the second input of the comparison circuit. At the output of the comparison circuit, the number of pulses received will be quantitatively equal to the duration or advance angle of fuel injection in degrees of rotation of the crankshaft (PCV), which is displayed on the first indicator. When measuring the duration or angle of advance of injection for ten cycles

engine operation is performed ten times the process pulses with their periods. The cumulative result with a decimal index also jumps to the first indicator.

After measuring the duration of the injection, the device automatically proceeds to measure the number of revolutions. In this case, when measured in one engine cycle, i.e. without averaging, a single period of the process pulses is compared with a calibrated time interval, for example, equal to two seconds at f 2 mHz. When working with averaging with a calibrated time interval, not one is compared, but

ten periods of process pulses, the filling frequency of which is ten times less than in the first case. For example, when measuring for one cycle and a calibrated time interval of 2 s, the filling frequency of one period of process pulses following two crankshaft turns is em f / 60, and ten periods when working with averaging - f / 600. The result of comparing one or ten pulse periods of a process with a calibrated interval, numerically equal to the number of revolutions per minute, is transmitted to the second indicator.

The device works as follows.

Process pulses in analog form, equal in duration to the duration; fuel injection will come from the output of the sensor 1 of the process through the first driver 3, which leads them to a logic level, to the output of the key 12 (Fig. 2a). With the installation of the first trigger 13 in the single state, this occurs when a triggering pulse is applied to its control S input (Fig. 26); the measurement cycle of the diagnosed parameters begins. The first of these measures the duration (advance angle) of fuel injection, and then the number of engine revolutions per minute.

The high potential from the output of the first trigger 13 (Fig. 2b) opens the key 12, and the process pulses pass through it to the first input of the first switch 19 and the countable C input of the second trigger 14. At the same time, the zero R input of the second trigger 14 through

446346

step formed by the second driver 4. Top dead center pulses (Fig. 2d), floor 1 from the output of sensor 2. Thus, at the output of the second trigger 14, pulses are formed that are proportional to the angle of fuel injection. These pulses are fed to the second input of the first switch 19. The supply of the external control potential to the input A of the device selects the duration or angle of injection advance measurement mode.

The pulse signal from the output of the first switch 19 (fig.2d) is fed to the second input of the exception circuit 22 connected in parallel, the counting C input of the third trigger 15 and

ten

15

five

0

five

0 The first input of the first circuit 23 is a match. The third trigger 15, on the leading edge of the pulse received on its counting one, is set to one state (Fig. 2e) and remains there until a reset pulse from the output of the second switch 20 (Fig. 2g) arrives on its zero state, which selects the number of measurement cycles (ten or one). At ten cycles, with the output of the second switch 20, its second input is connected, with one cycle - the first one. The control is performed by the external potential at the input B of the device.

Thus, when working with averaging, i.e. when measured in ten engine cycles, the reset of the third trigger 15 occurs by

0 to the leading edge of the tenth pulse of the process that arrived at the countable C input of the fifth divider 28 from the output of the exception circuit 22. In this case, the exclusion circuit 22, after supplying a pulse to its first input (Fig. 2b), passes all pulses from the second input to the output, except for the first (Fig. 2h). Thus, the duration of the time interval at the output of the third trigger 15 (Fig. 2e) will correspond to the duration of ten periods of the process pulses intended for filling with the frequency f / 720. When operating without averaging, the duration of the time interval at the output of the third trigger 15, also filled with frequency f / 720, will correspond to one period of the process pulses. Filling perio5

0

five

Dovs are implemented using the third matching circuit 25. Its first input receives a time interval equal to ten (one) periods of the process pulses, and the second receives the filling frequency f / 720 from the first output of the first divider 6. The pulses from the output of the third circuit 25 match

arrive through the second circuit 37 to the front of the tenth one (the first one when it is coupled to the countable C input of the fourth divider 9 and is brought to its binary form.

The third signal of the third trigger 15 also selects the process pulses intended to fill them with the frequency f Dp of this target. The signal from the direct output of the third trigger 15 is fed to the second input of the second coincidence circuit 24, to the first input of which process pulses are output from the circuit output 22 exceptions. These pulses are passed to the first combining circuit 36 and from its output (Fig. 2i) arrive at the first input of the fifth coincidence circuit 27 and the input of the fourth driver 31. After each period of the process pulses, i.e. on the leading edges of the pulses (Fig. 2i), at the output of the fourth driver 31, a short, about 0.5 µm pulse appears, which goes to the control D-input of the buffer register 35 and rewrites the contents of the fourth divider 9, which is the duration of the pulse period of the process in binary form. From the output of the buffer register 33, this binary code is fed to the second input of the comparison circuit 10. After this, the fourth divider 9 is reset with a pulse arriving at its zero R input from the output of the fifth shaper 32. At the same time, the latter forms a short, also about 0.5 X is a waste pulse on the trailing edge of the pulse of the fourth driver 31.

Thus, at the second input of the comparison circuit 10 along the leading edges of the process pulses, the binary code of their follow-up period is already present. The binary code at the first input of the comparison circuit 10, equivalent to

the duration of the pulses of the process, form the first indicator 11. On the back side, with the help of the second separator, the pulse front of the third formulator 7, on the counting C-input of which the spreader 30 (FIG. 2m), the incoming pulse packets of frequency f with step through the third circuit 38 of the output of the fifth circuit 27. Coincidence. At the seventh driver 34, the subsequent equality of codes at the inputs of the comparison circuit 10, a pulse is formed at its output, resetting the second divider 7 at the zero K input. The number of these pulses numerically equal to the duration (advance angle) of the injection in degrees PKV is third8. elitelem peredbote without averaging) process pulses received on the P-counting input of a fifth divider 28, the output of the second switch 20 is a pulse

5 (FIG. 2g), which the divider 28 has zeroed, resets the third trigger 15 to the zero state and sets the quarter trigger 16 to the one state. After installing the fourth

0, the trigger 16 operating in the counting mode, a high potential is removed from the information state in a single state. of the third trigger 15 and the process impulses arriving at the counting C input of the last, can no longer set it to the one state. In this case, the second coincidence circuit 24 does not allow the tenth (first) pulse at the output

0 process from its first entry. This and mylc is selected using the first matching circuit 23 and is fed to the second input of the first combining circuit 36 (Fig. 2L). For this, the fifth trigger 17 on the leading edge of the tenth (first) pulse of the process goes into the single state, and the tenth (first) pulse of the process passes through the first 0 yw matching circuit 23. The fifth trigger 17 is reset by the third pulse of the third generator 30 (Fig.2m), formed on the trailing edge of the tenth (first) pulse process. TaKiiM

5, the cycle of measuring the duration of the advance injection angle ends at the moment when the third driver 30 is triggered. At the same time, its output impulse arrives at the control

0 S-input of the first decoder 39 and rewrites into it the contents of the third divider 8, equal to the duration (advance angle) of fuel injection in degrees PKV. This information is ageodit5

The SRI triggers the third divider 8, thus, the third divider 8 is ready to count the number of revolutions of the engine per minute. The cycle of measurement of the number of revolutions starts from the moment of installation of the fourth trigger 16 into a single state with a pulse from the output of the second switch 20 (Fig. 2g). The output signal of the fourth trigger 16 (Fig. 2k) uses the fourth coincidence circuit 26 to fill ten, when working with averaging, process pulse periods with frequency f / 600. For one period in the measurement without averaging over ten engine cycles, the filling frequency is chosen to be f / 60.

15, the sixth divider 29 applies the frequency from the second output of the first divider 6. For example, for a calibrated time interval of 2 s and a coefficient

division of the sixth divider 29, is equal to. These frequencies are received respectively 20 th 10, this frequency is

0.5 MHz.

Upon completion of the captured time interval w at the output of the sixth driver 33, the fourth or third output of the first divider 6 is angry. The selection of the filling frequency, corresponding to the choice of the number of cycles, is performed using the third switch 21, controlled by external-25 pulse (Fig. 2b). ), look for a triple-time reset by its potential at the input B of the device, the sixth trigger 18, preliminary installation of the exception circuit 22, transfer of the first trigger 13 to a single

The state, permitting the start of the next output of the fourth circuit 26, the filling frequency, through the second combining circuit 37, is fed to the 30th duration measurement cycle and the counted C input of the fourth divider 9, the number of revolutions. The same impulse that converts the duration of the dec - (fig, 26) goes to the control of one (one) period impulse CR - 5 - input of the second decoder 40, in which the contents of the third divider 8 are rewritten, numerically equal to the number of revolutions per minute . The measurement result is displayed by the second indicator 41. On the trailing edge

process in binary form. After ten (one) pulse periods of the process, at the output of the fifth division 28, a waste pulse is generated, which passes to the output of the second switch 20. As a result, the sixth generator 33 resets the fifth splitter 28 and the installation 40 of the seventh generator 34 produces

to the zero state of the fourth flip-flop 16 operating in the counting mode. On the leading edge, the signal from the inverse output of the fourth flip-flop 16 to the sixth flip-flop 18 is set to one. Its output signal (fig.2n), which is a pulse of a calibrated time interval, for example, with a duration of 2 s, goes to the zero R input of the first trigger 13, prohibits further passage of the process pulses through the key 12. It also goes to the third input first combining circuits 36 for filling with a clock frequency f. On the leading edge of the pulse of a calibrated time interval from the output of the first combining circuit 36, the fourth driver

4DR 34

31 forms the write pulse of the content of the fourth divider 9 into the buffer register 35. Thus, on,. the second input of the comparison circuit 10

D

the beginning of her work counting the number of turns, there will be a binary code equivalent to the duration of the ten (one) process steps.

The signal from the inverse output of the sixth trigger 18 is supplied to the zero-divisor divider 29, allowing its operation. To countable C input

15, the sixth divider 29 applies the frequency from the second output of the first divider 6. For example, for a calibrated time interval of 2 s and a coefficient

0.5 MHz.

At the end of the capturing time interval w at the output of the sixth driver 33, a pulse is angry (Fig. 2b), look for a reset for resetting the sixth trigger 18, presetting the exception circuit 22, resetting, and allowing the start of the next cycle of measuring the duration and speed. The same impulse (Fig. 26) is fed to the control 5 - the input of the second decoder 40, to the cosbros of the third dongle 8, preparing it for the duration measurement cycle (advance angle) of the fuel injection.

Compared with the known device, in addition to measuring the angle. A fuel injection or ignition launcher allows you to measure the duration of fuel injection by a nozzle.

The measurement of the injection duration (advance angle) is carried out simultaneously with the measurement of the rotational speed of the crankshaft DVS. The possibility of measuring the advance angle

or the duration of the injection and the rotational speed per cycle of one or ten cycles of the process under study, allows to evaluate the irregularity of rotation of the crankshaft, i.e. stability

engine work. In addition, the measurement accuracy of parameters and the resolution for

by reducing the error in multiple measurements.

The use of the proposed device for diagnostics makes it possible to choose the most rational operating mode of the engine and, as a result, to increase its efficiency in terms of fuel economy and ensuring energy-efficient operating modes,

Claims (1)

Formula izob, reteni A device for diagnosing internal combustion engines, comprising sensors for the injection process and upper dead center, first and second generator, generator, first second, third and fourth dividers comparison circuit and first indicator, with sensors of injection process and upper dead center being connected respectively to the first and second the generator is connected to the first divider, the second divider is connected through the first input of the comparison circuit with the C input of the third divider and R-BXO, the house of the second divider, characterized in that Enhanced functionality and increased accuracy, the device is additionally equipped with a key, first, second, third, fourth, fifth, and sixth triggers, first, second, and third switches, an exception, first, second, third, fourth, and fifth the coincidence circuits, the fifth and sixth dividers, the third, fourth, fifth, sixth and seventh formers, the buffer register of the first, second and third unification schemes, the first and second decryptors, and the second indicator, and the output of the first shaper connect to the first input of the key, the second input connected to the output of the first trigger, and the output to the first input of the first switch and the C input of the second trigger, the R input of which is connected to the output of the second driver, and exit - with the second entrance of the first room a mutator connected to the input A of the device, the output of the first switch is connected to the second input of the exclusion circuit, the C input of the third trigger and 34 I 2 first in1 the house of the first coincidence circuit, the second input of which is connected to the output of the fifth trigger, and the output to the second input of the first combination circuit and via the third driver to the S input of the first decoder, to the output of which the first indicator, first indicator, first input TG Vtiyu of the combination circuit and the R input of the fifth trigger, the C input of the third trigger connected to the inverse, the direct output of which is connected to the second input of the second coincidence circuit and the first input of the third coincidence circuit, while the D input of the third trigger is connected to the inverse the output of the fourth trigger and the C input of the sixth trigger, and the R input of the third trigger with the input of the fourth trigger, the R input of the fifth divider and the output of the second switch, the third input associated with the input B of the device and the third input of the third switch, the first and second inputs of the second switch are connected respectively to the first and second outputs of the fifth divider, the C input of which is connected to the output of the exclusion circuit and the first input of the second coincidence circuit, the output connected to the first input of the first combination circuit, the third the input of which is connected to the direct output of the sixth trigger and the R input of the first trigger, and the output to the first input of the fifth coincidence circuit and through the quarter driver to the D input of the buffer register and the input of the fifth driver, the output of which is connected to the fourth input the divider, the C input of the second connection circuit connected to the output, and the output with the C input of the buffer register, the output of which is connected to the second input of the comparison circuit, the output of the fifth coincidence circuit connected to the C input of the second divider, and its second input connected to the input of the first divider, the first output of which is connected to the second input of the third coincidence circuit, the output connected to the first input of the second combining circuit, the second input of which is connected to the output of the fourth coincidence circuit, the first input of which is connected to the direct output of the fourth trigger, and the second with the output of the third switch, the first and second inputs of the third switch are connected respectively 13 .I4 / -1463 Respectively with the third and fourth outputs of the first divider, the second output of which is connected to the C-input of the sixth divider, the R-input connected to the inverse output of the sixth trigger, and the output through the sixth driver to the second input of the third unification circuit, the first input of the exclusion circuit, S- the entrance of the first trigger 1ПППППППППППППППППП  P eight shpppppppppppppppp 1 d e W I 3 and to l ff n I one ppppppppppppppppppppppppppppppppp PPPPPPPPPP1 PPPP Dj. Jl Jl KPPPPPPPPPPPPPPPPFPPPPCJ 3. -. - HI :.:but. , ... P pa, R-input of the sixth trigger and S-input of the second decoder, the output of which is connected to the second indicator to the output of the third unification scheme. p L -t Jl Jl P