SU1237939A1 - Test bed for diagnostic checking of technical condition of vehicle transmission - Google Patents

Abstract

The invention relates to stands for diagnosing the technical condition of vehicle transmissions. The purpose of the invention is to improve the accuracy and reduce the complexity of diagnosis. The vehicle is mounted with driving wheels on the support rollers 1, 2, the switch 20 is shifted to the position in which the switching elements 21, 22 close the contacts 24, 25, 27, 28. Disperse the vehicle to speed Vj. Disconnect the engine from the transmission input shaft. The rotation of the transmission occurs in the mode of free coasting under constant load. The difference of the signals arrives at the control element of the adjustable brake 3. In the free coasting process, when the speed reaches V, the first comparator 8 is triggered. Its normally closed contacts 9, 10 open. When installing switching bodies 20 to a different position, the switching elements 21, 22 close the contacts .23, 25 and 26, 28. The load in the tested transmission will vary according to the law generated by the sensor 15. 2 Il. and (L

Description

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The invention relates to the transport engineering industry and can be used to diagnose the technical condition of the transmission of vehicles.

The purpose of the invention is to increase accuracy and reduce the complexity of diagnosis,

FIG. 1 shows a page of the proposed layout of the stand; in fig. 2 is a graph of the frequency of rotation of the rollers during the overrun process at two levels of loading.

The stand contains support rollers 1, 2, an adjustable brake 3, kinematically connected to the support rollers 1, a sensor 4 of the rotational speed of the support rollers with a normalizing converter 5, a variable brake torque sensor 6 with a normalizing converter 7, the first comparator 8 with the first 9 and second JO normally closed contacts, second comparator 11 with normally closed contact 12 m normally open contact 13, setpoint block 14, unit 15, computing unit 16, differentiator 17, computing device 18, auto system 19 variable switch, switch 20 with switching elements 21, 22 and contacts 23-28 and registering device 29. Adjustable brake torque sensor 6 output through normalizing converter 7 is connected to one of the inputs of automatic control system 9, the first output of block 14 of settings through the second normally closed contact 0 of the first comparator 8 and the switching element 21 of the switch 20 are connected to another input of the automatic control system 19, the first input of the first comparator 8 is connected to the second output ohm of the setpoint block 14, the first output of the second comparator 1I is connected to the third output of the setpoint block 14, the second inputs of both comparators 8 and 11. The input of the differentiator 17 and the input of the computing unit 16 are connected via the normalizing converter 5 to the output of the rotational speed sensor 4 of the support rollers, the output of the differentiator 7 through the first normally closed contact 9 of the first comparator 8 is connected to the first input of the computing device 18 and through the normally closed

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contact 12 of the second comparator II - with the second input of the ultramixing device 18, the output of the computing device 18 through the normally open contact 3 of the second comparator And and the switching element 22 of the switch 20 is connected to the recording device 29,

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The sensing device 8 contains two memory blocks 30, 31, an adder 32, a resistor divider 33 and a dividing unit 34. The output of memory block 30 is the first input of computing device 18, the input of block

31 spam - the second input of the computing device 18. The output of the memory block 30 is connected to one of the inputs of the adder 32, the output of the memory block 3 is connected to another input of the adder

32 and with the input of the resistor divider 33, the output of the adder 32 is connected to one of the inputs of the dividing unit 34, the output of the resistor divider 33 is connected to another input of the dividing unit 34, the output of which is the output of the computing device 18. The input of the setting device 15 is connected to pin 33,

Dp of determining the resistance of the transmission to rotation, the vehicle is set by the driving wheels on the support rollers I, 2, the transponder 20 is shifted to the position in which the switching elements 21 and 22 close the contacts 24, 25, 27, 28, using the setting block 14 to set the preset level M (resistance of adjustable brake 3, accelerate the vehicle to speed V {detected by sensor 4 of the rotation frequency of the support rollers, and disconnect the vehicle engine from the input shaft of the transmission. In this rotation Transmission occurs in the free run mode under constant load M, (section I, Fig. 2). The load condition in the transmission is provided by a closed automatic control system 9, which compares the signal coming from the first output of the settings block 14 through the second normally closed contact 10 of the first comparator 8, and a feedback signal from the output of the normalizing converter 7. The difference of the signals (the error signal) is amplified and fed to the control element of the adjustable brake 3.

The setpoint block 14 represents three resistor voltage dividers and generates voltages corresponding to M ,, Vj and V. During the free run, the output of the differential 17 generates a signal proportional to the deceleration E of the vehicle's driving wheels, which through the first normally closed contact The first 9 KONinapaTOpa 8 and the normally closed contact 12 of the second comparator II are fed to the inputs of the memory blocks 30, 31. In the process of free running out at the moment (when the speed V

The first comparator 8 melts, its normally closed contacts 9, 10 open, which causes the deceleration value to be memorized in memory block 30. on the section and to the deviation of the adjustable brake 3. From the time point, the transmission rotates in the free run mode with the adjustable brake off (section II, Fig. 2). When the speed Vj reaches the moment, the second comparator II is triggered, which, using the normally closed contact I2, stores the deceleration value in the section 31 of the memory and connects the registering device 29 to the output of the computing device 18. From the outputs of the memory 30 and 3I the signals arrive at the inputs of the adder 32, at the output of which a signal is formed that is proportional to the difference (6, -fg). The resistor divider 33 performs the operation of multiplying the signal from the output of the memory block 3I by a constant factor corresponding to M. The signals from the output of the adder 32 and the resistor divider 33 are fed to the inputs of the divider 34, the output of which generates a signal proportional to the resistance of the transmission rotation, emom by formula

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The signal from the output of dividing unit 34 through the closed normally open contact 13 of the second comparator 1 and the closed contacts 27, 28 of the switch 22 is fed to the registering device 29. By the magnitude of the resistance to rotation of the transmission, determined by the device

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This formula describes the technical condition of the vehicle's transmission. When the switch 20 is installed in a different position, the switching elements 21 and 22 close the contacts 23, 25 and 26, 28. In this case, the load in the tested transmission changes according to the law generated by the setting device 15 and is controlled by the recording device 29.

Thus, in the proposed stand, two processes of free run-down of the transmission are reproduced in succession at two different load levels, which eliminates the need to determine the moment of inertia of the rotating masses of the transmission and the stand and improves the accuracy of diagnosing the technical condition of the transmission. Automatic determination of the resistance to rotation of the transmission reduces the complexity of diagnosis.

Claims (1)

Invention Formula A stand for diagnosing the technical condition of a transmission of sporting and sports equipment, comprising support rollers mounted on the base, an adjustable brake, kinematically connected to the support rollers, a speed sensor of the supporting rollers, a torque sensor of the adjustable brake, a setting unit, an automatic adjustment system, one the input of which is connected to the output of the torque sensor of the adjustable brake, and the output is with an adjustable brake, the calculating device and the recording device, which is schiys in that, for the purpose povsheni accuracy and reducing the complexity of diagnosing, it is provided with a differentiator having an input connected to the output speed sensor support rollers and tsvum comparator. tors, the first input of the first comparator is connected to the second output of the setting unit, the first input of the second comparator is connected to the third output of the setting unit, the second inputs of both. the comparators are connected to the output of the rotational speed sensor of the support rollers, the output of the differentiator is connected via the first normally closed contact of the first comparator to the first input of the computing device and through a normally closed contact the second comparator is connected to the second input of the computing device; the first output of the setpoint block is connected via the second normally closed contact of the first comparator to Editor N. Shvydka Compiled by N. Mazepa Tehred; In. Kadar Proofreader E. Sirohman Order 3281/43 Circulation 778 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk iab., d. 4/5 Production and printing company, Uzhgorod, st. Project, 4 The input of the automatic regulation system is 1.1, and the output of the computing device is connected via a normally open contact of the second comparator to the recording device.