SU1281958A1 - Device for determining the misfiring failures in internal combustion engine - Google Patents

Abstract

The invention relates to engine building and makes it possible to increase the reliability and reliability of the control by determining the number of idle cylinders. The device contains a pressure sensor 1 and amplifiers 2, the number of which corresponds to the number of engine cylinders, the matching circuit 3, the load sensor 4, the selector 5 s. two inputs, forma f fs 6, 8, the upper dead center sensor 7, 9 revolutions counter with three inputs, a device for skipping slots 14, a frequency divider 15, a subtracting counter 16 and indicators 17, 18 and 19. The device also includes comparison circuits 10, 13, frequency adjuster 11 and counter 12 skip flashes with two inputs. Unit 11 is set to the number of revolutions, for which the outbreaks of flares should be considered, and Unit 14 is set to the number of maximum allowable skips for the given number of revolutions. In counter 16, a number equal to the number of engine cylinders is set. If for the number of revolutions less than the one specified on the circuit 13, the number of pulses arrives as specified by the setting device 14, the circuit 13 generates a signal arriving at the alarm 19, which provides the relevant information about the skip, crashes or stops the engine. 1 il. (L

Description

one

The invention relates to a measurement technique, namely to a means of diagnosing internal combustion engines.

The aim of the invention is to increase the reliability and reliability of the control.

The drawing shows a block diagram of the device.

The device contains sensors 1

pressure and amplifiers 2, the number of which corresponds to the number of engine cylinders, matching circuit 3, load sensor 4, pressure selector 5 with first and second inputs, first driver 6, upper dead center sensor 7, second driver 8, counter 9 turns with first, second and the third inputs, the first circuit 10 in comparison with the first and second inputs, the frequency master 11, the counter 12 skip flashes with the first and second inputs, the second circuit

12

When the engine from the sensor 7

13 comparisons with the first and second entrances - 25 top dead center for each obomi, unit 14 skip flashes, frequency divider 15, subtractive counter 16, as well as indicators 17, 18 and 19. Pressure sensors 1 in the cylinders of the internal combustion engine are connected via amplifiers 2 to scheme 3 matching. The output of the matching circuit 3 and the engine load sensor 4 are connected to the inputs of the flash pressure selector 5, the output of which is connected via the driver 6 to the first input of the subtracting counter 16, to the second input of which the upper dead center 7 is connected. The output of the imaging unit 8 is connected to the first input of the rotational speed counter 9, the second input of which is connected to the second output of the detracting counter 16, the output of the rotational speed counter 9 is connected to the first input of the first comparison circuit 10, to the second input of which the frequency adjuster 11 is connected. The output of the first comparison circuit 10 is connected to the third input of the 9-turn counter and the second input of the flash skip counter 12, the first input of which is connected to the output of the subtractive counter 16, which is also connected to the indicator T7. The output of the flash skip counter 12 is connected to the indicator 18 and the first input of the second comparison circuit 13. The unit 14 passes the outbreaks of the crankshaft under the pulse, which comes through the driver 8 to the input of the divider 15 and the counter 9 turns. From the output of the divider

The 30–15 pulse corresponding to the beginning of the crankshaft revolution of a two-stroke engine, and for a four-stroke engine, the engine cycle enters the second input of the subtractive counter 16, starts it, and starts the counting cycle of the gaps (inoperative cylinders) during the engine's working cycle.

When pulling out the pressure in the cylinder

40 increases dramatically. This increases the signal from the pressure sensor 1 in the cylinder in which the explosion occurred. This signal is fed to the input of the corresponding amplifier 2,

45 and then through the matching circuit 3 to the input of the pressure switch selector 5. If the input signals from the sensor 4 of the engine load and the matching circuit 3 match the selector 5

50 generates a signal at the first input of the subtracting counter 16.

Thus, for the cycle of engine operation, the number of signals equal to the number of cylinders in which there were no gaps in the whole, and the final result on the first output of the counter 16 corresponds to

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It is connected to the second input of the second comparison circuit 13, the output of which is connected to the signaling device 19.

The device works in the following 5 ways.

Before starting the setting of the crankshaft frequency adjuster 11, the number of revolutions is set, which should be considered as misses, and 0 as the setting device for 14 misfires — the number of maximum allowable misses for the given number of revolutions. Divider 15 sets the division factor corresponding to the division of the pulses arriving at its input, by one for two-stroke engines, or two for four-stroke engines, to obtain at its output signals corresponding to 20 engine cycles. In the subtractive counter 16, a number equal to the number of engine cylinders is set.

When the engine from the sensor 7

15

- 25 top dead center for each revolution of the crankshaft impulse comes, which through the driver 8 is fed to the input of the divider 15 and the counter 9 turns. From the output of the divider

15, the pulse corresponding to the beginning of the crankshaft rotation of the two-stroke engine, and for the four-stroke engine, the engine cycle, goes to the second input of the subtractive counter 16, starts it and starts the counting cycle of vpc (idle cylinders) during the engine's duty cycle.

When pulling out the pressure in the cylinder

increases dramatically. This increases the signal from the pressure sensor 1 in the cylinder in which the explosion occurred. This signal is fed to the input of the corresponding amplifier 2,

and then through the matching circuit 3 to the input of the pressure switch selector 5. If the input signals from the sensor 4 of the engine load and the matching circuit 3 match the selector 5

generates a signal at the first input of the subtracting counter 16.

Thus, for the cycle of the engine, the number of signals equal to the number of cylinders in which there were no omissions in the entire array goes to the input of the subtracting counter 16, and the final result on the first output of counter 16 corresponds to the number of cylinders in which the skip occurred, or number of passes per cycle.

engine work. When arriving from divider 15, the second input of the subtracting counter 16 of the next pulse is the total digit of the count from its digital output goes to the first input of the counter 12 skips of flashes and indicator 17, and the source 16 returns to its original position and starts a new counting cycle. In this case, the rev counter 19 starts counting pulses arriving at its input from the second driver 8 only when its signal is received at the second input from the second output of counter 16. The signal at the second output of counter 16 appears at the end of the counting cycle if the total digit of the count

not equal to zero, i.e. There are skipping flashes. From the output of the counter 9 revolutions, the signal goes to the first comparison circuit 10, which outputs the signal when the number of pulses from the counter output 9 revolutions is equal to the number of revolutions set by the frequency adjuster 11. The output signal from the first comparison circuit 10 sets the 9-rev counter and 12 flare-skip counter to the initial position. When glitches are missed, the counting cycle is repeated.

If for the number of revolutions less than the set frequency (determined by the frequency setting unit 11) for the second circuit

13 comparing pulses come as much as given by the setting device

14 passes of flashes, the circuit 13 you-, generates a signal, which arrives at the signaling device 19, which gives out the relevant information about the passage of the flashes (light, sound, etc.)

OR stops the engine.

Thus, the introduction of a deducting counter and a frequency divider into the device makes it possible to determine the number of inoperative cylinders per. one cycle of the engine.

Using the proposed device, due to the determination of the number of non-working cylinders, ensures timely troubleshooting, which ultimately leads to fuel economy and increase in service life.

Claims (1)

Invention Formula A device for detecting gaps in a vppeik in an internal combustion engine, comprising pressure sensors and amplifiers whose number corresponds to the number of engine cylinders, matching circuit, load sensor, pressure selector with the first and second inputs, the first driver, the upper dead center sensor, the second driver, revolution counter with the first and second inputs, the first comparison circuit with the first and second inputs, frequency adjusters, the skip counter with the first and second inputs, the second comparison circuit with the first vym and second entrances and gate master outbreaks, with sensor outputs the pressure is connected via amplifiers to a matching circuit whose output is. is connected to the first input of the pressure selector, the second input of which is connected to the output of the load cell, and the output of the pressure selector is connected to the inlet. the house of the first generator, and the output of the top dead center sensor is connected to the input of the second generator, the output of which is connected to the first input of the revolution counter, the output of which is connected to the first input of the first comparison circuit, the second input of which is connected to the frequency adjuster, but. output - with the first input of the skip counter; 1) the output of the flash skip counter is connected to the cervical input of the second comparison circuit, the second input of which is connected to the skip peak setting device, characterized in that, in order to increase reliability, it additionally contains a frequency divider and subtracting the counter with the first and second inputs and the first and second outputs, and the revolution counter is additionally provided with a third input, with the first input of the subtracting counter being connected to the output of the first driver, but. second entrance - with. the output of the frequency divider, the input of which is connected to the output of the second driver, and the first output of the subtractive counter is connected to the first input of the flash skip counter, the second output of the subtractive counter is connected to the input of the revolution counter, the second input of which is connected to the output of the first comparison circuit.