SU1377648A1 - Method and apparatus for estimating technical condition of vertical transmission of two-shaft internal combustion engine - Google Patents

Abstract

The invention reduces the complexity of evaluating the state of vertical transmission. The device consists of a pressure sensor 1, an electronic key 2, a differentiator 3, a comparator 4, electronic keys 5 and 7, a sensor 6 of intervals of equal length, a recorder 8 of the number of angular intervals, a sensor 9 of angular positions and a recorder 10 of the number of cycles. The angular spacing markers of the same distance are set at the same distance from each other on any rotating part rigidly connected to one of the engine shafts. On modes xx and rated load, the angular position of the lower crankshaft is recorded. In one of the cylinders shut off the fuel supply. On modes x.x. and nominal include sensors 1,6 i 9. For 10–20 consecutive cycles, the readings of recorders 8 and 10 are recorded. Then for both modes. find the quotient from dividing the readings of the recorder 8 by the readings of the recorder 10. The state of vertical transmission is estimated from the difference in the angular positions of the lower crankshaft, corresponding to the maximum gas pressure in the cylinder under the x.x modes, and the nominal load. 2 sec. fl :, 5 ill. you, iS

Description

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The invention relates to the operation and can be used to diagnose the vertical transmission of twin-shaft internal combustion engines.

The purpose of the invention is to reduce the complexity of assessing the state of vertical transmission.

Figures 1 and 2 show the angular positions of the cranks at the position of the lower piston in V, m, t, respectively, when the engine is running at idle and rated power | FIG. 3 shows a device for carrying out the method; Fig, 4 - graphs of dependencies registered parameters; on fig.Z - diagram of the choice of gaps in the vertical transmission.

The device consists of a pressure sensor 1 mounted on an indicator tap of a selected cylinder, the output of which is connected via the first electronic key 2 to the input of the differentiator 3, and the comparator 4. The output of the comparator 4 is connected to the control of the second electronic key 5, the sensor 6 of the number of angular intervals is identical The second and third electronic keys 5 and 7 are connected to the recorder 8, the number of angular intervals. The sensor 9 of the angular positions is connected to the recorder 10 number of cycles and to the control inputs of the electronic keys 5 and 7.

The angular spacing markers of the same COBO extent, for example 0.1, are set at the same distance from each other on any rotating part rigidly connected to one of the engine shafts; mainly with the bottom. Structurally, the angular interval gauges of the same angular extent can be made of a strip of reflective material uniformly fixed along the generatrix, and the first gauge (the first strip) is reinforced several angular degrees before the BMT. for example, over 10, the sensor 6 of the number of angular intervals may be a combination of a photodiode illuminator. Sensor 6 is fixedly mounted on a non-rotating engine part in the plane of rotation of the markers. When the angular position of the lower piston is not income 10 to TDC, the sensor 6 is opposite the first marker of angular intervals

(opposite the first strip). When the shaft rotates, the pulses produced by the sensor 6, the number of which is directly proportional to the number of 6 interval intervals passed by the sensor, are sent to the recorder 8 only when the electronic keys 5 and 7 are open,

The sensor of the angle position sensor 9 is also attached to a rotating part rigidly connected to the engine shaft, but already in a different plane perpendicular to the axis of rotation of the shaft. Structurally, the marker can be made of a strip of reflective material with an angular length of more than 10 °. The beginning of the marker can be 11 ° before the arrival of the piston shaft of the TDC, Sensor 9 can also be a combination of the illuminator-photodiode. Sensor 9 is fixedly mounted on a non-rotating engine part in the plane of rotation of the marker. When the angular position of the beginning of the strip of the marker is 11 or more to TDC, the sensor 9 is located opposite the beginning of the strip of the marker. When the motor shaft rotates, sensor 9 generates one signal for each revolution of the shaft and these signals are summed by the driver 10, the output of sensor 9 is connected to the control inputs of keys 4 and 7, these keys are only opened when sensor 9 produces electrical signal.

A pressure sensor 1 is connected via an electronic control key 2 to a differentiator 3, at the output of which a signal proportional to the first derivative of the gas pressure in the cylinder appears. At the time of maximum pressure in the cylinder, this derivative is zero. A comparator 4 is connected to the differentiator 3; it triggers a zero signal proportional to the first derivative of the gas pressure in the cylinder. The output of the comparator 4 is connected to the control input of the electronic switch 5. At the time the first derivative of the gas pressure is reached, the electronic switch 5 closes.

The method is carried out as follows:

When the engine is running at the appropriate idle mode and the fuel supply to the selected cylinder is turned off for each revolution of the shaft

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the recorder 10 from the sensor Y receives one signal. The beginning of the signal's origin corresponds to the angle, and the end to the angle L, as shown in Fig. 4 (position 9). At the time the electric signal is generated by sensor 9, electronic keys 2 and 7 are opened, and they will be open until the signal produced by sensor 9 disappears. When the first marker of the angular intervals approaches the sensor 6, it begins to generate electrical signals, the number of which is equal to the number of angular interval markers (position 6 in FIG. 4). When the electronic keys 7 and 5 are open, these signals are fed to the recorder 8 and added together. The gas pressure sensor 1 in the cylinder produces a signal proportional to the gas pressure (position 1 in FIG. 4). This signal is amplified (amplifier not shown) and through open electronic key 2 is fed to 25

the input of the differentiator 3, where it is differentiated (position 3, figure 4).

At the top volumetric dead point (PTOM), the pressure in the cylinder with the fuel supply turned off is maximum, therefore the derivative pressure at this moment is zero. The comparator 4 triggers a zero signal proportional to the derivative of the pressure and closes the electronic key 5. When the key 5 is closed, the pulses to the counter 8 stop. The next turn of the shaft (two-stroke engine is considered) one pulse goes back to the counter 10, and 8 - r d pulse. These pulses are summed at each counter. At steady state of engine operation, it is enough to produce from30

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stroke and rated power is -; quotient from dividing the readings of the counter 8 by the readings of the counter 10. This dividing is the average number of pulses produced by the sensor 6 in the corner portion from the installation point of the first marker of the angular intervals to the installation point of one of the following markers when the maximum pressure in the cylinder is reached, those. with the position of the pistons in the PTO. Since the markers are located in advance at a certain angular distance from each other (for example, 0.2 °), the product of this angular distance by the average number of pulses is the angle of rotation of the lower shaft crank from a fixed and accurately known angular mark to PTIS. Similarly, the angle of rotation of the crank of the lower shaft from the fixed angle mark to the PTT is in nominal mode or close to it. The difference in these angles of rotation characterizes the technical condition of the vertical transmission.

Claims (2)

1. A method for evaluating the technical condition of a vertical transmission of a two-shaft internal combustion engine fitted with indicator cylinder cranes, means that in idle and nominal load modes the angular position of the lower crankshaft is recorded, in order to reduce the labor intensity, additionally disable fuel supply to one of the cylinders, to its indicator crane ustanavlp Measurements in 10-20 consecutive cyc-45 ° pressure sensor, register fi ah  The readings of counters 8 and 10 are recorded and the engine is loaded to nominal or close to nominal power at the nominal speed, the same at. On the 1st, measurements were made on .g, -, on th move. When the steady state is reached, the fuel supply to the same cylinder is turned off and the sensors 1.6 and 9 are switched on again. Again. A 10-20 consecutive cycles, the readings of counters 8 and 10 are recorded. Then for idle mode 0 five the maximum gas pressure in the cylinder and the corresponding angular position of the lower crankshaft, and the state of vertical transmission is estimated from the difference in the angular positions of the lower crankshaft corresponding to the maximum gas pressure in the cylinder during idling and nominal loads. 2. A device for evaluating the technical condition of the vertical transmission of a two-shaft internal combustion engine J including marks 1k and an angle position sensor, and The gauge is connected to the lower crankshaft of the engine, and the sensor is connected to the engine block, characterized in that, in order to reduce the labor intensity, the device further comprises a pressure sensor connected in series, a first electronic key, a differentiator, a comparator, a second and third electronic keys, and angular interval sensor, angular interval number recorder and cycle recorder, and QOi / e.r The angular interval sensor is connected to the third electronic key, the angular interval number recorder is connected to the second electronic key, the angle number recorder is connected to the third angle key and the first electronic key is also connected to the angle sensor and the third electronic key, and the pressure sensor installed on the indicator valve of the cylinder. Phie. 2 dP Hd LUN livot Phie. SGffT VOMT o (zk H BMTH 6LH- 6 5uOi2 n VMGN VOPT BtlTB 0us. five in about fir in NTV of, g / 7. / 7. / g. . d, p.n, K.8