SU1495161A1 - Apparatus for controlling vehicle speed - Google Patents

Abstract

The invention relates to transport and is aimed at improving the traction properties. When the pedal of the controller 10 is pressed, the contactor 6 is turned on, a starting voltage is applied to the starting resistor 4, the relay coil 17 and the winding 5 kor. The excitation current in the winding 2 is regulated by the current regulator 1 at the command of the control unit 8, to which the control signal from the controller 10 and the current sensor 9 is received. As the frequency of rotation of the traction motor increases, the EMF of the winding 5 core increases, the voltage on the winding 17 of the relay decreases, and the voltage relay shuts down. The contacts 18 of the voltage relay are closed, forcing the current by the regulator 1 in the excitation winding 2 and in the winding 16 of the current relay. The current relay is turned on, the closed contacts 19 of the voltage relay and the contacts 20 of the current relay turn on the key element 14, supplying power to the winding 15 of the contactor 7. The shunting of the starting resistor 4 by the contactor 7 during forced excitation reduces the current surges in the winding of the 5th push motor traction characteristics of the vehicle are improved. 1 il.

Description

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The invention relates to the field of transport, in particular to devices for controlling the speed of vehicles.

The purpose of the invention is to increase the traction properties.

The drawing shows an electrical block diagram of the device.

The device contains a current regulator 1 connected in series with the motor winding 2 of the traction motor and connected to the battery 3. The starting resistor 4, connected in series with the core winding of the 5th motor, is connected to the battery 3. The second contactor 7 is connected in parallel to the starting resistor 4. The excitation control unit 8 is connected by an output to a current controller 1, one of the inputs to a current winding sensor 9 9, another input to one of the controller 10 outputs. Kon the roller 10 includes contacts 11 and 12, the moving contacts of which are the controller input and connected to the battery 3, and the stationary contacts to the controller outputs to which the winding 13 of the contactor 6 and the input of the key element 14, for example, are connected in the form of a thyristor. The coil 15 of the contactor 7 is connected in series with the key element 14. The coil 16 of the current relay is connected to the circuit of the current regulator 1, the coil 17 of the voltage relay is parallel to the starting resistor 4. Some of the disconnectors 18 of the voltage relay are connected to the third input of the unit 8 control of the excitation, and the other disconnecting contacts 19 of the voltage relay are connected in series with the closing contacts 20 of the current relay, which connects the input of the key element 14 to its control electrode.

The device works as follows.

When the pedal of the controller 10 is pressed, a control signal is supplied to the control unit 8 and the contacts 12 are closed, through which the winding 13 of the contactor 6 is powered. The contactor 6 is turned on and a current flows through the main winding 5 of the motor. The resistance of the starting resistor 4. Simultaneously, the control unit 8 generates a control signal supplied to the field current controller 1 and a current flows through the field winding 2.

At the same time, until the EMF of the electric motor's core winding 5 reaches a certain level, the voltage drop across the starting resistor 4 exceeds the voltage relay turn-on threshold. Consequently, the voltage relay at start-up is turned on and its opening contacts 18 and 19 are open,

By further pressing the pedal of the controller 10, its contacts 11 are closed and the key Element 14 is energized, however, it remains locked,

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as long as its control input circuit is open.

As the vehicle accelerates, the voltage on the starting resistor 4 decreases and the voltage relay 17 turns on.

When the contact 18 is closed, the control unit 8 generates a signal for the maximum excitation current, which is fed to the excitation current regulator 1, which leads to forcing the current in the excitation winding 2 and, accordingly, to turn on the current relay 16. In this case, when the voltage relay is turned off and the current relay 16 is turned on, the control input circuit of the key element 14 is closed and it energizes the winding 15 of the contactor 7 and the latter is turned on.

After turning on the contactor 7, the vehicle speed is controlled by adjusting the current in the excitation winding 2 of the traction motor.

The contactor 7 is turned off only when the pedal of the controller 10 is reversed, when its contacts 1 1 open.

This technical solution allows to improve vehicle speed properties, reduce dynamic loads in the transmission and reduce energy losses in the starting resistor 4, because the starting resistor 4 8 controls, during the closure of which the current is forced into the excitation winding 2 and the second time. The closing contacts 19 are connected to the control input circuit of the key element 14 connected in series to the circuit the winding 17 of the contactor 7, in this case, the relay of the excitation current is connected to the circuit of the excitation winding 2; time at start-up and reduces the loss of electrical energy in the starting rheostat 4.

The proposed engineering solution can be used in an electric vehicle speed control device.

Claims (1)

Invention Formula A device for controlling vehicle speed, containing a current regulator connected in series with the excitation winding of an electric motor and connected to a battery, parallel to which a root winding of the electric motor, another contactor is connected, connected to a starting resistor and one of the contactors parallel to the starting resistor, the excitation control unit, the output of which is connected to the current controller, one of the inputs to the current sensor of the core winding, and the other of the inputs to one from the outputs of the controller connected to the input to the battery, the other output to the winding of one of the contactors, and the third output to the input of the key element connected in series with the winding of the other contactor, characterized in that. In order to improve the traction properties, it is equipped with a current relay and a voltage relay, the winding of which is parallel to another contactor, one contact is connected to the third input of the excitation control unit, and the other contacts are connected in series with the contacts of the current relay connecting the key element input with a control electrode, wherein the winding of the current relay is included in the circuit of the current regulator.