SU1451581A2 - Arrangement for testing i.c. engine - Google Patents

Abstract

The invention makes it possible to improve the accuracy of determining the technical condition of an internal combustion engine (two). During operation of the CWS, sensor 2 generates pulses, the frequency of which is proportional to the current value of the crankshaft rotation frequency (CWKV). The converter 3 connected to sensor 2 generates a continuous signal, the amplitude values of which are picked up by the selector 4 and fed through distributor 5

Description

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To the input of the unit 6 for determining the magnitude of the dispersion of the amplitude values of the PMWFs. Simultaneously, the pulses of the sensor 2 are fed to the input of the counter 8, which is started and stopped respectively from the sensors 14-17 of the ignition moments and the sensor 7 of the upper: dead center of all cylinders. Vcode counter code is converted to

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The invention relates to testing of internal combustion engines, in particular to devices for assessing the technical condition of engines.

The purpose of the invention is to improve the accuracy of determining the technical condition of an internal combustion engine.

FIG. 1 shows the proposed device, a general view; in fig. 2 is a diagram of the device in which the sensors of the boundaries of the cycles are made in the form of sensors for the ignition moments of each cylinder; Fig. 3 is a diagram of the device in which the top dead center sensor (in mt) and the ignition timing of one cylinder are used as the sensors of the boundaries of the cycles.

The device (Fig. 1) contains a gear element 1 rigidly mounted on the motor shaft, a rotation frequency sensor 2, the output of which through the first frequency converter 3, the spinner 4, the amplitude values selector 4 and the amplitude values distributor 5 is associated with block 6 determining the magnitude of the dispersion of amplitude values. The output of the upper dead center sensor 7 (v, mt) of all engine cylinders is connected to the first input of counter 8, the second input of which is connected to the sensor output of 9 ignition points of all cylinders. The third input of the counter 8 is connected with the output of the sensor 7, mt. (in Fig. 1, the connection is not shown), and the output of the counter 8 through the second converter 10 and the distributor 11 of the ignition advance angles is connected with the unit 12 for determining the dispersion value and the average value of the ignition advance angle. The output signal is fed through the distributor 11 to the input of the block I2 for determining the dispersion value and the average value of the ignition advance angle. Toggle switches 18-21 make the choice of a diagnosed cylinder. The evaluation of the technical condition of the DCC is carried out on the output signals of blocks 6 and 12. 3 Il.

For each sensor, 13 cycle boundaries are connected to the corresponding control- and control inputs of the valves 5 and 11. In the device shown in

FIG. 2, the sensors of the boundaries of the cycles are made in the form of sensors 14-17 ignition points of all cylinders. The outputs of the sensors 14-17 are connected to the second input of the counter 8. The first controls

The 0 inputs of the valves 5 and 1I are connected through the first contacts of the toggle switch 18 to the output of the sensor 14 and through the second contacts of the toggle switch 18 to the output of the sensor 15 .. The second control inputs of the valves 5 and 11 are connected through the first contacts of the toggle switch 19 to the output of the sensor 15, and through the second contacts of the toggle switch 19 - to the output of the sensor 16. Third control inputs of the valves 5 and 11 are connected through the first contacts of the toggle switch 20 to the output of the sensor 16, and through the second contacts of the toggle switch 20 to the output of the sensor 17. Fourth control inputs of the valves 5 and I1 connected h Through the first contacts of the toggle switch 21 to

the output of the sensor 17, and through the second contacts of the toggle switch 21 to the output of the sensor 14.

О The device works as follows.

When the engine is operating, at the output of sensor 2, pulses appear, the frequency of which is proportional to 5 at the current value of the frequency of rotation of the motor shaft. The converter 3 forms at its output a continuous signal, the amplitude values of which are allocated by the selector 4 and fed through the distributor 5 to the input of the value determining unit 6

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dispersion of the amplitude values of the rotation frequency.

At the same time the pulses from the sensor 2 are fed to the input of the counter 8, for start. and which is stopped, respectively, from sensors 14-17 of ignition points and sensor 7 in, m, t. all cylinders. The output code of the counter 8 is converted into a continuous signal and is fed through the distributor 11 to the input of the block 12 for determining the dispersion value and the average value of the ignition angle. The tumblers 18-21 produce a selection of a diagnosed cylinder.

In the device shown in FIG. 3, the sensor 13 of the cycle boundaries is implemented as a sensor. 7 in mt each

a cylinder with a former 22 and a sensor for early ignition angles, supplying 23 instants of ignition to the first with a cyan informational and four uptindra with a former 24. At the outgoing inlets, and a unit for determining sensor 2 has a form factor variance and mean

Tel 25. Converter 3 is made of the angle of advance of ignition,

in the input of the generator 26, the cipher counter, 25 wherein the sensor output of the upper dead torus 27, the input register 28, the key-point of all cylinders is connected to the pepper 29 and the control unit 30. The first, second and third inputs of the block 30 are combined with the corresponding inputs of the converter 3 And are connected respectively to the outputs of the drivers 25, 22 and 24, and the distributors 5 and P vy30

The input of the counter, the second input of which is connected to the output of the sensor for the ignition moments of all cylinders, the output of the engine shaft rotation speed sensor is additionally connected to the third input of the counter, the output of the next through the second converter and the angle distributor were transferred without control inputs

The device works as follows.

The pulses from the sensor 2 through the driver 25 are fed to the first input of the converter 3, the measurement of the frequency of rotation of the motor shaft is performed in the time interval between pulses

from sensors 23 and 7 using the elements of the Converter 3.

Claims (2)

In the following, the operation of the device shown in FIG. 3 is similar to the operation of the device shown in FIG. 2. The formula of the invention Testing device for internal combustion engine, auth.St. No. 979941, in order to improve the accuracy of determining the technical condition of the engine, it is additionally equipped with an upper dead center sensor for all cylinders, an ignition timing sensor for all cylinders, a pulse counter equipped with three inputs, a second converter, and the second meter input, the second input of which is connected to the output of the ignition torque sensor of all cylinders, the output of the engine shaft speed sensor is additionally connected to the third input of the counter, the output of the second through the second converter and the ignition angle distributor and the average value of the ignition advance angle, and the control inputs of the ignition timing distributor connected to the corresponding outputs of the sensor boundaries of the cycle.