JPS62138001A - Fore-and-aft controller for electric rolling stock - Google Patents

Abstract

PURPOSE:To prevent the uncontrolled operation of a car by checking rationality in the direction of the phase sequence of output voltage from an inverter and a fore-and-rear driving command. CONSTITUTION:A rotionality checking section 13 checks the rationality of an output from a phase sequence detecting section 11 detecting the phase sequence of an output from an inverter device 1 and a fore-and-rear driving command from a master controller 6. When the absurdity of the fore-and-rear driving command and phase sequence determining the direction of the revolution and propulsion of a drive motor is detected as the result of a rationality check, a gate control section 19 instantaneously stops a gate, and the reverse movement of an electric car is prevented. The gate is stopped while a line breaker 3 is turned OFF, and the power supply side is interrupted. Accordingly, rationality can be checked completely in fore-and-rear driving control, thus obviating the reverse movement of the electric car.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to forward and backward movement control of an electric vehicle, and is particularly suitable for controlling the forward and backward movement of an electric vehicle when the direction of one rotation of propulsion of the drive motor is different from the commanded direction. Concerning the control device.

[Background of the invention]

Conventional forward/reverse control devices that control the propulsion and rotation direction of the drive motor of electric vehicles have mechanical contacts in the main circuit of the device, which is mechanically switched by the forward/reverse command, and inevitably the main circuit changes. Since this has been confirmed, a method of moving the drive motor has been adopted.

On the other hand, with the development of electronics technology, both the main circuit and control circuit of the single forward/reverse control device have become contactless, and as a result of this convenience, it has become extremely difficult to confirm the change of the main circuit, which was necessary in the past. Ta.

Fig. 1 is a main circuit diagram of an electric train that uses a VVVF (variable voltage variable frequency) inverter as the power converter and a three-phase induction motor as the drive motor, and a control block diagram including front and rear control. The forward and backward movement control at this time is performed by changing the phase order of the three-phase electric power applied to the three-phase induction motor. In other words, the output U of the VVVF inverter device,
The phase order of V and W phases is changed by forward and reverse commands.

The operation shown in FIG. 1 will be explained. The inverter device 1 consists of a switching element section 2 using GTO elements, and an output voltage is supplied to a three-phase induction motor 17 which is a drive motor. The current interrupter 3 is used to turn on/off the contact line power to the inverter device.

The main controller 6 handled by the driver issues a forward/brake command and a forward/reverse command F or R. The car/brake commands are input to a pattern generator 7 necessary for various controls, and a slip frequency pattern fsp, which is one of the patterns, is output. The inverter frequency calculation unit 8 detects the rotation frequency of the three-phase induction motor 17 (speed pulse sensor 1)
The outputs fr and fsp of 4 are inputted and the output becomes the inverter frequency finv, which suppresses the output voltage of the inverter device. A PWM signal is input to the voltage suppressor 16 and the pulse mode switching section 9, and each output performs pulse width modulation.
The signal is input to the modulation section 10. The output of the PWM modulation section is input to a three-phase distribution section 12 that distributes the output into three phases each having a phase of 120 degrees. One of the outputs of the three-phase distribution section 12 is directly inputted, and two of the outputs are inputted via the forward/backward switching section 14 to a gate control section 19 that ultimately controls the gate signals of each phase. Forward and reverse movement control is performed by switching the V-phase and W-phase signals, for example, in the forward/reverse switching section 14.

The gate amplifier section 15 is connected to the upper and lower G of the switching element section 2.
Switching of the TO element is performed.

In the above circuit configuration, for example, the forward/reverse switching section 1
4 or the gate control unit 19 may be incorrectly made or defective parts, the phase order of the output voltage of the inverter device 1 may become a phase order different from the forward/backward command of the main controller 6, and the inverter device 1 may start in the opposite direction to the command. be.

This situation is extremely dangerous, especially when there is a dead end line at the terminal station or a railroad crossing on the entering side of the station.

For this reason, as disclosed in Japanese Patent Application Laid-Open No. 52-149713, there is a known system that opens the main circuit and applies the brakes by comparing the direction of the driving command and the direction of rotation of the induced city engine. It is.

However, this method has the problem that it is difficult to distinguish between the following slope start (uphill start), and it is difficult to use pre-control at the same time.

The rotational direction detection unit 18 in FIG. 1 detects the rotational direction of the drive motor using the outputs of the speed pulse sensors 4 and 5 that have a phase difference. The activation control method changes when the vehicle moves in a different direction. Therefore, do not open the main circuit. That is, when starting on an uphill slope, the air brakes on the train's wheels are released, a forward command is given, the torque of the drive motor increases, and the train moves forward after it is balanced against the slope resistance. In this way, 8tJJ on an uphill slope causes the vehicle to temporarily move in a direction different from the forward/backward command, but in order to start running, the inverter device must be operated without stopping, and the inverter device must be stopped. I can't.

In other words, simply detecting the rotational direction of the drive motor and checking its rationality cannot determine whether it is a temporary retreat caused by starting on an uphill slope, so it cannot be a perfect method to prevent the vehicle from moving in the opposite direction. .

[Purpose of the invention]

An object of the present invention is to provide a safe vehicle control device in a forward/backward motion control device for an electric vehicle.

[Summary of the invention]

The present invention prevents the vehicle from running out of control by checking the rationality of the forward/reverse command and the output voltage of the inverter in the phase-sequential direction.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

The difference between FIG. 1 and FIG. 2 is the phase sequence detection unit 11 that detects the phase sequence of the output of the inverter device l, its output, and the master controller 6.
The rationality check section 13 that checks the rationality of the forward and backward movement commands from the vehicle and its output is connected to the gate control section 19.

Note that the phase order detection method is to determine based on the voltage and current output from the inverter device.

As a result of the rationality check, if it is detected that the forward/reverse command, the rotation of the drive motor, and the phase sequence that determines the propulsion direction are unreasonable, the gate control unit 19 immediately stops the gate and prevents the train from moving backwards. Of course, along with the gate stop, the current interrupter 3 is turned off to cut off the power supply side.

With this method, it is possible to distinguish between a case where the vehicle temporarily retreats due to uphill startup and a case where the phase order becomes abnormal, so runaway can be safely and reliably detected without adversely affecting slope startup control.

As described above, according to this embodiment, a complete rationality check can be performed in the forward and backward movement control, which has the effect of preventing the train from moving backwards.

〔Effect of the invention〕

According to the present invention, there is an effect that safe forward and backward movement control is performed.

[Brief explanation of drawings]

FIG. 1 is a main circuit diagram and a control block diagram of a VVVF inverter device in which both the main circuit and the control circuit, including the 5 forward/backward control, are electrically non-contacted. FIG. 2 is a main circuit diagram and a control block diagram in which a device for checking the rationality of the forward/reverse command and the rotation/propulsion direction of the drive motor according to the present invention is provided. 1... Inverter, 17... Induction motor, 6...
Main controller (which commands the direction), 14... Forward/forward switching (control) section, 11... Phase sequence detection section, 13... Rationality check section.

Claims (1)

[Claims] 1. A control device for an electric vehicle that includes an inverter, an induction motor supplied with power by the inverter, a device for commanding the propulsion and rotational direction of the drive motor, and a forward and backward movement control unit that operates according to the commands. 1. A forward/backward motion control device for an electric vehicle, comprising a device for checking the rationality of a forward command and an inverter output voltage in a phase forward direction.