JPH07163010A - Control equipment of electric rolling stock - Google Patents

Abstract

PURPOSE:To make an electric rolling stock operate at a constant acceleration by calculating the acceleration of the electric rolling stock without using a variable load detector. CONSTITUTION:An output of a pulse generator 6 provided t a rotating shaft of an induction motor 5 is connected to a revolution number detector 21, an output of the revolution number detector 21 is connected to an acceleration computing unit 22, an output of the acceleration computing unit 22 and an output of an acceleration setting unit 24 are inputted to an acceleration comparator 23, an output of the acceleration comparator 23 is inputted to a current command value regulating circuit 25 and a current command value (Io) obtained by regulative computation by the current command value regulating circuit 25 is given to an inverter control circuit 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to acceleration control of an electric vehicle using an induction motor driven by an inverter as a drive motor.

[0002]

2. Description of the Related Art FIG. 2 shows an example of the configuration of a conventional electric vehicle controller, in which electric power is supplied from an electric train line 1 to an inverter 3 via a pantograph 2, and the inverter 3 supplies AC power to an induction motor 5. The controller 7 receives the outputs of the current detector 4, the output of the induction motor pulse generator 6 installed on the rotation shaft 5, and a current command value (I _O),
A current command value (I) to be input to the inverter control circuit 11 according to the output values of the inverter control circuit 11 that operates to give a desired control signal to the inverter 3 and the variable load detector 8 that detects the load applied to the electric vehicle _And a current command value calculation circuit 12 for calculating _O ).

[0003] In the control device 7, when controlling the acceleration of the electric vehicle, the inverter control circuit 11 by the output of pulse generator 6 and a current command value (I _O), well-known methods of induction motor is Performs slip frequency control to control the torque generated by the induction motor 5 in an optimum state,
At that time, the output current of the inverter 3 is set to an optimum value by the output of the output current detector 4.

[0004]

In the above-mentioned conventional example, in order to accelerate an electric vehicle with a constant acceleration, a variable load detector for detecting a load applied to the electric vehicle is required. It also requires a current command value calculation circuit for calculating a current command value corresponding to the generated torque of the induction motor corresponding to the predetermined acceleration from the output value of.

An object of the present invention is to provide a circuit for controlling the acceleration of an electric vehicle which does not require the variable load detector and the current command value calculation circuit.

[0006]

In order to solve the above problems, according to the present invention, in an inverter for driving an induction motor, an inverter control circuit for controlling an output current of the inverter according to a current command value, and the dielectric control circuit. A rotation speed detector for detecting the rotation speed of the motive, an acceleration calculator for calculating the acceleration of the electric vehicle by the output of the rotation speed detector, an acceleration setting device for setting the acceleration of the electric vehicle, and the acceleration calculator. And an acceleration comparator for comparing the output of the acceleration setting device and an output of the acceleration setting device, and a current command value adjusting circuit for adjusting the current command value based on the output of the acceleration comparator.

[0007]

According to the present invention, the rotation speed is detected by the rotation speed detector by the output of the pulse generator installed on the rotation shaft of the induction motor, and the acceleration is calculated from the change of the rotation speed per unit time. The calculated acceleration is compared with a preset acceleration set value, and when the calculated acceleration is smaller than the acceleration set value, the current command value is increased, and the calculated acceleration is larger than the acceleration set value. At this time, a current command value adjusting circuit for reducing the current command value is provided, and the output of the current command value adjusting circuit is input to the inverter control circuit to obtain the desired acceleration of the electric vehicle.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a control device for an electric vehicle showing an embodiment of the present invention. In FIG. 1, those having the same functions as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. That is, in the control device 20 in FIG. 1, the rotation speed detector 21 is controlled by the output of the pulse generator 6 installed on the rotation shaft of the induction motor 5.
The acceleration calculator 22 calculates the acceleration from the change in the rotation speed per unit time, and the acceleration setter 2
4 is compared with the acceleration set value output by the acceleration comparator 23, and when the acceleration is smaller than the acceleration set value, the current command value ( _IO ) is increased, and the acceleration is the acceleration. A current command value adjusting circuit 25 that reduces the current command value (I _O ) when the current value is larger than the set value is provided.
By inputting the current command value (I _O ) which is the output of the current command value adjusting circuit 25 to the inverter control circuit 11,
The electric car is driven at a desired acceleration.

[0009]

According to the present invention, when the electric vehicle is accelerated at a constant acceleration, the output of the pulse generator installed on the rotary shaft of the induction motor is utilized, which is more accurate than the conventional method. The acceleration of the electric car can be calculated, and the load detector is not necessary. Further, when decelerating the electric vehicle, the deceleration can be calculated by the method of the present invention.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a control device for an electric vehicle showing an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional electric vehicle control device.

[Explanation of symbols]

1 ... train line, 2 ... pantograph, 3 ... inverter, 4 ...
Output current detector, 5 ... Induction motor, 6 ... Pulse generator, 7 ... Control device, 8 ... Response load detector, 11 ... Inverter control circuit, 12 ... Current command value calculation circuit, 20 ... Control device, 21 ... Rotation speed Detector, 22 ... Acceleration calculator, 23
... acceleration comparator 24 ... acceleration setting unit, 25 ... current command value adjusting circuit, I _O ... current command value.

Claims (1)

[Claims] 1. In an inverter for driving an induction motor, an inverter control circuit for controlling an output current of the inverter according to a current command value, a rotation speed detector for detecting a rotation speed of the induction motor, and the rotation speed. An acceleration calculator that calculates the acceleration of the electric vehicle based on the output of the detector, an acceleration setter that sets the acceleration of the electric vehicle, and an acceleration comparator that compares the output of the acceleration calculator and the output of the acceleration setter. And a current command value adjustment circuit that performs an adjustment calculation of the current command value based on the output of the acceleration comparator.