SU1379674A1 - Method and apparatus for assessing condition of radiator sections of a motor vehicle cooling device - Google Patents

Description

The invention relates to the field of monitoring and diagnostics of cooling devices of vehicles and can be used in automated systems.

The purpose of the invention is to show accuracy.

The method is carried out as follows.

The reference value of the state index of section J, corresponding to the section with uncontaminated heat exchange surfaces and qualitatively fixed with 1 plate to its tubes, is preliminarily determined. The value is determined by experimental (based on the results of testing the cooling unit with radiator reference sections) or calculated by the results of the calculation of the mathematical model of the cooling device

In the process of determining the technical condition of the sections in operation, the mode of operation of the vehicle is set corresponding to the heat sink in the radiator, which is close to nominal. Water temperatures (t) and outside air (t) at the entrance to the section and air temperature (tjj) after the i-th diagnosed section are measured.

Calculates the state score. For example, for a section of this type, the following t values are obtained; 624; t, 20 C, t -; 35, l With these results, the indicator of condition f; 0.367,

Compare the value; with reference 1 and by comparison, it is established that the section is faulty (water contaminated per section cavity).

To reliably assess the state of the section, a maximum tolerance is established for the condition indicator of a working section and the reference value of the indicator equal to ± 0.1, which corresponds to 15% tolerance for reducing the heat transfer coefficient of the section in the operation

FIG. 1 shows a block diagram of the device; Fig. 2 shows the primary circuit diagram of the device without sensors for water and air temperature at the inlet n of the radiator section.

The device contains sensors for measuring 1 temperature of water 1 and air 2 and 1, block 4 of recording, re,

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versatile electric drive 5, permanent magnet 6, chain of 7 reed switches. Olok 8 electric drive.

The permanent magnet b and the chain 7 of the gerkonon form the marker 9 of the position of the sensor 3.

Sensors 1-3 are electrically connected to the registration unit 4. The actuator 5 is mechanically connected with the sensor 3 and the permanent magnet 6, electrically with the control unit 8. The reed switch chain 7 is electrically connected to the control unit 8.

Magnet 6 has a magnetic connection with a chain of 7 reed switches Sensor 3, electric drive 5, magnet 6 is mounted on a common frame. The frame has a window, the dimensions of which coincide with the dimensions of the front of one section of the radiator. This window contains a sensor 3 consisting of three copper resistance thermometers located along the vertical axes of symmetry corresponding to three equal-sized window areas. Through the upper guide rollers, the frame rests on the upper guide frame. The lower guide rollers together with the lower guide frame restrict the movement of the frame in the direction perpendicular to the plane of its movement. Through the pulley mounted on the shaft of the electric motor, the wire is laid, the ends of which are fixed on the opposite walls of the cooling chamber of the chamber (the roller is directed to the rollers, the frames, the pulley and the cable are not marked). The mutual arrangement of the magnet 6 and the corresponding reed switch of the chain 7 (one reed switch from the chain is shown) is determined depending on the sensitivity of the reed switches and the engine running out after power is turned off. The number of reed switches and chain 7 is equal to the number of sections.

The electric drive control unit 8 contains two 1.; BM-polarized polarized relays Yu with three switching groups of contacts, display elements 11-13, button 1D, iodes 5 h 16, connecting terminals 17-20, resistors 21-23, capacitor 2D filter o

The actuator 5 contains an asynchronous two-phase electric motor; a holder 25 and a phase-shifting capacitor 26. (The output capacitor terminal is connected to the first output of the tractor winding

electric motor and contact 18, the other output of the capacitor is connected to the second output of the stator winding and contact 19, The third output of the stator winding is connected to the output 27 of the control unit 8 and to the output 28 of the reed switch string 7.

The chain of 7 reed switches consists of reed switches with one switching group of contacts. The first pin of the chain is connected to the second pin of the power source, the second pin is connected to pin 17, the third pin is connected to pin 28, the fourth pin is connected to pin 20, the fifth pin is to pin 29. The first pin of the chain connects the switch contact of the first reed switch. The normally closed contact of the front reed switch is connected to the third pin of the chain. A normally open contact of the first reed switch is connected to the second output of the chain, and a normally open contact of the first reed switch is connected to the fourth output of the chain, and a normally open contact of the last reed switch is connected to the fourth output of the chain except the first and the last one. and with the fifth pin of the chain.

One pin of the first winding of the relay is connected to pin 17 and normally closed by the contact of the first contact group of the relay, the other winding pin is connected to the normally closed contact of the second contact group. One terminal of the second winding of the relay 10 is connected to terminal 20 and the normally open contact of the first contact group, the other winding terminal is connected to the normally open contact of the second contact group. The switching contact of the first group is connected to the output 29 and one output of the button 14, the switching contact of the second group through a series-connected diode 15 is connected to the switching contact of the third group and the first output of the power source (the polarity of the diode's activation is determined by the polarity of the relay windings), Normally closed and normally open contacts of the third group are connected respectively with pins 19 and 18 “The second pin of the button 14 is connected to the outlet 27.

The device works as follows.

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After applying the supply voltage by pressing the button 14, the sensor 3 is set in motion. The direction of movement is determined by the position of the contacts of the polarized relay 10 and can be anything depending on the initial installation of the sensor (opposite the first or last section of the radiator section). The sensor moves until it is opposite the next section. In this case, the corresponding reed switch under the action of the magnet 6 will open the power supply circuit of the engine 25 and the sensor stops. By pressing the button again, the sensor can again be set in motion. When the sensor reaches one of the extreme sections of the relay section 10, under the action of one of the extreme reed switches, it switches and permits movement of the sensor in the opposite direction. The lamps 11 and 13 of the display indicate the direction of movement, the lamp of the display 12 indicates the stopping of the stop. In the stop state, all temperatures t ,, t, tj are measured, respectively, by sensors 1-3 and measurement registration by unit 4. The measurement result can be presented visually, if the recording unit is made as an indicating device, it can be recorded on an intermediate carrier (magnetic or punched tape) for further processing or processing immediately, if the recording unit is equipped with appropriate automatic means. According to the measurement results, the state indicator of the i-th section is calculated (automatically or manually) by the formula

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The obtained value of the indicator is compared (automatically or manually) with the reference level „. If the value of the indicator; differs from the reference one by more than 15%, the section is recognized as faulty.

Claims (1)

1. A method for evaluating the technical condition of sections of a radiator of a transport cooling device, mainly a diesel locomotive, which includes measuring the temperature of the coolant at the inlet of the section at a given vehicle operation mode, with the aim of measuring the temperature at the output of the section air, and at the entrance - the outside air temperature, and the technical condition is estimated by the ratio of the difference in air temperature behind the section and the outside air at the entrance to the section to the difference in temperature Atur heat medium and the outside air inlet section, A device for assessing the technical condition of the radiator sections of a vehicle cooling device, comprising temperature measurement sensors, one of which — for measuring coolant temperature — is installed at the entrance to the radiator section connected to a recording unit, characterized in that , other sensors are installed at the inlet to the section for measuring the outside air temperature and at the outlet of the section for measuring the air temperature behind the section, while the sensor measuring the air temperature behind the section with it is packed with a reversible electric drive for longitudinal movement of this sensor along radiator sections and a position indicator of the goog sensor connected to the unit controlled by the electric drive. 3, The device according to claim 2, characterized in that the sensor position sensor is made as installed along a series of radiator sections of a chain of serially connected reed switches with switching groups, normally closed contacts of which are sequentially connected between the output of the power source and the electric drive, normally open the reed switch is connected to the first marker pole, the normally open contact of the latter the reed switch is connected to the second output of the marker, the normally open contacts of all the reed switches of the chain, besides the first and the last, are connected in parallel with the third output of the marker, and the permanent magnet mechanically connected to the electric drive and interacting with the reed switches, 0 4 "The device according to claim 2, that is, the electric drive control unit contains a double-winding polarized relay, one output of the first winding of which is connected to the first input of the position indicator and the normally closed contact of the first contact group of the relay, The second output of the first winding of the relay is connected to the normally closed contact of the second contact group, the first output of the second winding of the relay is connected to the second output of the position indicator and the normally open contact of the first contact group, the second output of the second obm the relay is connected to the normally open contact of the second contact group; the changeover contact of the first contact group is connected to the third output of the marker OQ position and a normally open contact of the start button, a flip contact of the second group through a series-connected diode connected to the common output of the unit, normally closed and normally open contacts of the third contact group connected respectively to the first and second inputs of the electric drive, flip contact of the third contact group connected to the common output unit, the second output of the start button is connected to the normally closed contact of the last reed switch position marker and the third output of the actuator The common output of the control unit is connected to the output of the power supply. 0 five rig. 2 To b / 1ku registration