SU1455256A1 - Apparatus for monitoring non-uniformity of load distribution among i.c. engine cylinders - Google Patents

Abstract

The invention relates to engine-building and makes it possible to increase the accuracy of control. The device contains sensors 1 and 2 of the angle of rotation of the crankshaft and engine cycles, counter 3 cycles, valve 4, control key 5, generator 6 of exemplary frequency, i channels, where i is the number of engine cylinders consisting of key 7 Adder 8, Corrector 9, Divisor 10 and Comparison Unit 11, Averaging Unit 12, Display Unit 13. Block 12 contains an adder 14 and a divider 15. A number equal to the number of pulses from generator 6 that passed through key 7 during the time of the gates of this cylinder during all measurement cycles and the number of pulses corresponding to the correction accumulate on the accumulator of each cylinder. This number, having passed the divisor 10, goes to the second input of block 1 and to one of the inputs of block 1. To the other inputs of the last, the numbers from the corresponding adders, the other cylinders arrive. The average and corrected number of generator pulses 6, the pass —Seex during the measurement on one cylinder, goes to the first inputs of the blocks and, and the difference obtained in them goes to block 13. This value is proportional to the deviation of the engine rotation speed in the measurement area from the average value. engine frequency in all such zones, which characterizes the uniform distribution of the load on the engine cylinders. 2 Il. (L ate sp o1

Description

I The invention relates to engine construction, and can be used, ib in particular, for continuous monitoring or evaluation of the technical state of an internal combustion engine.

The purpose of the invention is to improve accuracy.

: Figure 1 shows the block diagram of the device; Fig. 2 shows an exemplary embodiment of a dispenser introduced into the device.

The device contains (Fig. 1) sensor 1 of the angle of rotation of the crankshaft sensor 2 cycles of engine operation, counter 3 cycles, valve 4, control key 5, generator 6 of exemplary frequency, i channels, where i is the number of engine cylinders consisting of a key 7, an adder 8, a corrector 9, a divider 10 and a comparison unit 11, as well as a device averaging unit 12 and a display unit 13 common to the device. Block 12 contains an adder 14 and a divider 15.

The device distributor includes (FIG. 2) a counter 16, a decoder 17, a dial pad 18 and a selector 19, in which the number of channels is equal to one layer of cylinders, and each channel contains two elements AND 20 and 21 and a trigger 22.

The output of the sensor 1 is connected to the distributor 4, the second output of which is connected to the output of the sensor 2 cycles, also connected to the counter 3 cycles. The output of the counter 3 is connected to the control input of the key 5, to the main input of which the output of the generator 6 is connected, and to the output - the main inputs of the keys 7.

The distributor 4 has i outputs for the number of cylinders. Each of them is connected to the control input of the corresponding key 7, the output of which is connected to one of the inputs of the adder B. The second input of the latter is connected to the equalizer 9, and the output is connected to the divider 10. The output of the divider 10 is connected to the second input of the corresponding block 11, comparing and averaging unit 12. The output of the latter is connected to the first inputs of all the blocks AND the comparison, the outputs of which are connected to the display unit 13.

As averaging unit 12, an adder 14 and a divider 15 can be used, and the inputs of the adder 14 are the inputs of the unit 12. The output of the sum

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the mater is connected to the input of a divider 15, the output of which is the output of averaging unit 12.

As the distributor 4 can be applied to the device, the specific implementation of which is shown in figure 2. Distributor 4 contains a counter 16, the inputs of which are the inputs of the distributor and are connected to the sensors of the angle of rotation of the crankshaft and the cycles, and the output is connected to the decoder 17, three outputs of which are connected to three deci , B, C typesetting floor 18. Each

40

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Yes, these tires are connected to the channels of the selector 19, the number of which i is equal to the number of engine cylinders. Each channel of the selector 19 consists of

0 of the two elements And 20 and 21 and the trigger 22. Each of the elements And has three entrances associated with tires A, B, C typesetting floor. The outputs of the elements And 20 and 21 are connected to the inputs of the corresponding x triggers 22, the outputs of which are the outputs of the distributor 4.

The device works as follows.

Preliminary, when the device is installed on the engine, corrections are introduced in the correctors 9 for each cylinder, determined on the adjusted engine, and in the distributor 4 - the PCV angles, which define the beginnings of the measurement zones selected for each cylinder. This engine is independently measured by the actual positions of the top dead center (TDC) of the cylinders and by calculating the crankshaft angles under load. These angles determine the moment of opening of the corresponding key 7. It should be remembered that the magnitude of the gating angle, i.e. the width of the zone is the same for all cylinders. .

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Counter 3, dividers 10 are set to measure the required number of cycles (e.g. 64 or 100 cycles). When the motor rotates the shaft, the sensor 1 of the shaft angle of rotation and the sensor of 2 cycles produce two series of pulses: one with an interval, for example, 1 ° of the PCV angle; the other is at intervals of one engine cycle (360 PCV angles for a two-stroke engine and 720 ° for a four-stroke engine).

14552

On a signal to start the measurement, arriving at the counter 3 cycles, after the pulse from the sensor 2 corresponding to the TDC of the cylinder at the compression stroke (TDC 1), the counter 3 opens the key 5. The distributor 4 receives both pulse series from the sensors I and 2 successively opens and closes the keys 7, to the main inputs of which the pulses from the generator 6 are supplied. The pulses from the generator 6, through the key 5 to the key 7 (during the time of turning the motor shaft to the required angle), pass to the 15 adder 8, the second input of which is from the corrector 9 The number of pulses corresponding to the amount of correction for each cylinder is given.

Thus, the adder 8 of each cylinder during the measurement time accumulates a number equal to the number of pulses from the generator 6 that passed through the key 7 in. The duration of the strobes of this cylinder: for all 25 measurement cycles, and the number of pulses corresponding to the correction. This number, divided by divider 10 by the number of measurement cycles, is implied by & the counter 3 is fed to the second input of the comparison unit 30-11 and to one of the inputs of the averaging unit 12. The other inputs of the averaging unit are received, the numbers from the corresponding adders 8 remaining cylinders.25

The total number received in block 12 from all adders 8, and divided therein by the number of cylinders, i.e. the average for the engine, and the corrected number of impulses of the generator 40, passing during the measurement on each cylinder, goes to the first strokes of the comparison blocks 11 of each cylinder. The difference obtained in the blocks

11 enters block 13 of indication- 45

Thus, the display unit 13 for each cylinder displays a value proportional to the deviation of the engine speed in the measurement zone (gating) from the average motor frequency in all zones, which characterizes the uniform distribution of the load across the engine cylinders.

The distributor works as follows.

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yu 15

20 25 30 25

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five

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The input of the counter 16 is received from the angle sensor 1 pulses with a predetermined angular interval and from the 2 cycle sensor — one pulse per engine cycle (360 ° PCV angle for a two-stroke engine and 720 ° for a four-stroke engine). The pulses from angle sensor 1 are converted to the binary code of the current PCV angle, updated by the signal from the cycle sensor. The binary code in the decoder 17 is converted into a binary-decimal code supplied (when the PCV a 1 angle measurement is discrete) to three decade-wire A, B, C (unit, tens and hundreds tires) of the dial-up field 18, from where signals to the selector channels 19. Each channel consists of two elements, And 20 and 21, and trigger 22. One of the And elements triggers at the PCV angle corresponding to the angle of the channel of the measurement zone (tf;), and the second at the angle c, + (+ f, where (fe is the gating angle. Therefore, at the output of the trigger 22, the signal appears when the PKV angle corresponds to gating, and this signal opens the key 7.

The distributor 4 in combination with correctors 9, adders 8 and the sensor 1 of the PKV angle, which provides high discreteness of the measurement of the PKV angle, allows you to precisely select the measurement zone (strobe) for each cylinder and take into account the individual characteristics of their manufacture, installation and measurement. Counter 3 cyclone and dividers 10 allow for inter-cycle irregularity due to measurements over a large number of engine cycles.

Claims (1)

Thus, a set of input elements consisting of a cycle counter, a distributor, correctors, adders and dividers in the channel of each cylinder and their connections makes it possible to increase the reliability of engine state information by increasing the tuning accuracy and sensitivity of the system. and excluding the effect of random disturbances in the operation of the controlled engine. Invention Formula A control device for uneven distribution of load across the cylinders of an internal combustion engine, comprising a crankshaft angle sensor g cycle sensor, control key, pulse generator, averaging, display unit and 4 l each cylinder block by comparison and key, and the display unit inputs are connected to the outputs blocks are comparable to “and, the first inputs of which are connected to the output, and the second inputs to the input of the averaging unit and the keys, the output generator connected to the main input, {) from the distributor inputs, another input The 4th control key, the output of which is connected to the main inputs of the key, which, in order to improve the accuracy of the mouth, also contains a counting 15 tlHK cycles, a distributor and a series-connected equalizer. 1455256 an adder and a divider, the total number of which is equal to the number of cylinders, the divider outputs are connected to the averaging unit and the corresponding comparison units, the control input of the control key is connected to the output of the cycle counter, the input of which is connected to the output of the cycle sensor and one which is connected with the output of the sensor, the angle of rotation of the crankshaft, and the outputs, the number of which corresponds to the number of engine cylinders, are connected to the control inputs of the keys, the outputs of which are connected to the second inputs of the corresponding totalizers. which is connected with the output of the sensor, the angle of rotation of the crankshaft, and the outputs, the number of which corresponds to the number of engine cylinders, are connected to the control inputs of the keys, the outputs of which are connected to the second inputs of the corresponding totalizers. P 2Q yy 21 Mn cyl. one go r1 / fcwff cyl. g convection1 Fick, 2