RU2364525C2 - Device to automatically eliminate electric rolling stock wheel-motor units skipping and skidding - Google Patents

Abstract

FIELD: railway equipment.

SUBSTANCE: invention relates to electric rolling stock. Proposed device comprises pickups of current parametres to be read off the wheel-motor units, logical elements to extract maximum (MAX) and minimum (MIN) values from aforesaid current parametres, automatic actuators to act on the said units, logical element OR, computing unit and automatic regulator comparator element. Outputs of aforesaid pickups are connected to the said elements to extract maximum (MAX) and minimum (MIN) values from aforesaid current parametres. Inputs of the said logical element OR are connected to outputs of MAX and MIN elements. Computing unit inputs are connected to the outputs of pickups of current parametres. Outputs of logical element OR and computing unit are connected to comparator element inputs. The said comparator element incorporates linear amplifier connected to automatic actuator inputs.

EFFECT: higher reliability and efficiency.

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Description

The invention relates to railway transport, and more particularly to a device for the automatic protection of wheel-motor blocks of electric locomotives and electric trains from blocking of their wheelsets during traction or from skid during electric braking.

A device for the automatic elimination of boxing and skidding, containing wheel speed sensors and a logic unit for comparing the readings of these sensors with the allocation of the maximum and minimum values from these readings [1].

The disadvantages of this device are the complexity of the equipment of each wheel pair with a sensor of its speed and their small MTBF.

These disadvantages are eliminated in a device for automatic elimination of boxing and skid, in which only current sensors of traction electric motors and a logic block are used to mutually isolate the maximum MAX and minimum MIN signals and compare them, as well as actuating elements of automation to act on the traction motors to stop boxing and yuz [2].

The disadvantages of this device are related to the inability to determine the reference level of the source signal to generate the resulting signal for the detection of boxing or skid and its unsuitability for traction motors in series connection.

As a prototype of the claimed device, it is advisable to adopt a device for automatically eliminating boxing or skidding of wheel-motor blocks of electric rolling stock, containing sensors for current values of currents of traction electric motors, the outputs of these sensors being connected to elements to extract the maximum MAX and minimum MIN from the indicated current values, and also executive elements of automation for influencing wheel-motor blocks [3].

четкого опорного уровня для однозначной идентификации процессов боксования или юза в процессе развития и ликвидации указанных процессов, и его непригодность для тяговых двигателей при последовательном соединении.The disadvantages of the prototype are that it does not provide high efficiency protection, due to the determined inertial device on principle

a clear reference level for the unambiguous identification of boxing or skid processes in the development and elimination of these processes, and its unsuitability for traction motors in series connection.

The technical result of the present invention is to increase the efficiency and, especially, the speed of the device for the automatic elimination of boxing and skidding of wheel-motor blocks of electric rolling stock for any connection of traction motors.

This goal is achieved by the fact that an additional computing unit is provided, connected by its inputs to the outputs of the sensors of the current values of the measured parameters and designed to calculate the average current value of these parameters as the value of the reference signal, and an OR logic element connected to the outputs of the elements to highlight the maximum and the minimum values of the measured parameters, and the outputs of the counting block and the logic element are fed to the input of the comparison element with a linear amplifier, you the course of which is connected to the inputs of the executive elements of automation.

The device (see drawing) is designed to protect against blocking and skidding of wheel-motor blocks KMB ₁ ÷ KMB _n (corresponding to the number of axles of the locomotive). Each of these KMBs contains a traction motor ТД ₁ ÷ ТД _n and a wheel pair KP ₁ ÷ KP _n with traction gearboxes and intermediate components not shown in the drawing.

There are sensors DP ₁ ÷ DP _{n of the} measured KMB parameters, the output signals of which are fed to the inputs of the elements 3 highlighting the maximum (MAX) and 4 minimum (MIN) values, as well as the inputs of the computing unit 5, which calculates the average value of the same IP parameters ₁ ÷ PI _n . These parameters may include the following:

- current loads of traction motors (parallel branches of engines);

- voltage on series-connected motors;

- KMB rotation frequency.

The outputs of the elements MAX and MIN are connected to the inputs of the logic unit 6 (OR), the output of which is supplied directly and through a differentiating circuit 7 to the inputs of the comparison element 9 of the automatic controller 8. The output signal of the counting-decisive block 5 is also input to the input of the comparison element. comparison is fed to the input of the linear amplifier 10 of the controller 8, the output signal of which is connected to the inputs of the actuating elements of the automation 11 and 12, respectively, designed to affect the electromagnetic parameters traction motors and to enable the pulse peskopodachi IPP. The output of block 11 is connected to the control system for traction electric motors TD ₁ ÷ TD _n , and the output of block 12 is connected with nozzles 13 ₁ ÷ 13 _n providing a pulsed sand supply under the wheel pairs KP ₁ ÷ KP _n .

The proposed device operates as follows. Under conditions of normal coupling, the output signals of blocks 5 and 6 are equal in their current value and the signal at the output of controller 8 is zero, and blocks 11 and 12 do not work.

If boxing or skidding starts at least one of the wheel-motor blocks KMB ₁ ÷ KMB _n during traction or braking, then a difference appears between the output signals of blocks 5 and 6, calculated and amplified by the regulator 8. The output signal of the regulator includes actuators 11 and 12 , providing a decrease in traction or braking of engines that have lost adhesion, with a simultaneous pulse feed of sand with nozzles 13 ₁ ÷ 13 _n . This quickly eliminates traction loss.

Technical and economic efficiency of the device is ensured by increasing the sensitivity of detection of excessive slip and, accordingly, accelerated restoration of normal adhesion, significantly reducing sand consumption and road ballast pollution.

Information sources

1. SV Pokrovsky "Improving the adhesion properties of locomotives." Vestnik VNIIZHT, 1997, No. 4, pp. 35-39.

2. S.T. Volkov and others. Protection against boxing and skid wheel sets without the use of speed sensors. Abstracts of the scientific conference “Status and prospects of the development of electric locomotive”. Novocherkassk, 1994, pp. 40-41.

3. H.Yu. Butkevich. A device for detecting the use of vehicle wheelsets. Description of the invention to the application 94026062, cl.6 B60L 3/10.

Claims (1)

A device for automatically eliminating boxing and skidding of wheel-motor blocks of electric rolling stock, containing sensors for current values of the operating parameters of wheel-motor blocks, including electrical parameters of traction electric motors, the outputs of these sensors being connected to the elements to extract the maximum MAX and minimum MIN from the specified current working values parameters, as well as actuating elements of automation for influencing wheel-motor blocks, characterized in that l a logical OR element connected to the outputs of the MAX and MIN elements with its inputs, designed to provide the necessary algorithm for eliminating boxing or skidding both in parallel and in series connection of traction motors, as well as a computing unit connected by its inputs to the outputs of the current value sensors operating parameters and designed to calculate the average current value of the specified parameters, and the outputs of the logical element OR and the computing unit are connected to the inputs of the element with equalities with a linear amplifier, the output of which is connected to the inputs of the executive elements of automation.