JPS63114507A - Control method of vehicle - Google Patents

Abstract

PURPOSE:To control a vehicle within maximum adhesion capable of being utilized most efficiently by detecting the torque of each induction motor and controlling total currents so that the torque does not exceed a fixed value. CONSTITUTION:A controller 2 controls voltage V and frequency F applied to a VVVF inverter main circuit 3 by the deviation of a pattern value IOP from a current pattern generating section 1 and the total currents IO of a plurality of motors. When the currents I1-I4 of each motor exceed current set values I1max-I4max corresponding to previously set adhesion at that time, the deviation is detected by a lower priority circuit 7, and the value of DELTAI0 is subtracted under conditions in which the polarity of the currents I1-I4 is brought to a negative value. Accordingly, even when the wheel diameters of the induction motors IM1-IM4 differ, the generated torque of a shaft generating maximum torque can be controlled within the limit of adhesion.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a traction motor control device for a railway vehicle.

[Conventional technology]

A variable voltage, variable frequency (hereinafter referred to as VVVF) inverter output voltage limiter is installed, and when trying to increase the inverter output voltage to compensate for the reduced current due to idling, the voltage limiter generates an output voltage above a certain level. control to prevent it from happening. JP-A-55-125005 aims at a similar purpose, but even if there is a torque imbalance between the axles, this publication does not find it. In other words, even if the total current is constant, idling may occur due to unbalanced current in each axis, but in that case it is invalid.

[Problem that the invention seeks to solve]

The biggest drawback of the VVVF inverter is that if there is a difference in the diameter of the wheels installed on the 1. This causes thermal problems for M. Therefore, one 1. Although it is desirable to control M, this is often difficult to achieve due to economic reasons. The present invention aims at a middle ground between the two, and controls a plurality of units 1 and M with one control device. ) for each 1. It is controlled so as not to affect M.

In other words, either 1. If the torque applied to M (current flowing in) exceeds a predetermined value, this control device controls the total current.

The purpose is to control the torque of 1.M, which exceeds the limit, to within a predetermined value. Normally, a large current flows into 1 and M, which are attached to the wheel with the smallest wheel diameter, making it more likely to cause slipping and skidding.

[Means for solving problems]

Ideally 1. It is desirable to give the same torque to M, but each 1. Even though the voltage applied to M and the command frequency are the same, each 1. Since the rotational speed of M differs due to the difference in wheel diameter, a difference in inflow current occurs, resulting in a difference in torque, which can at least cause slipping, skidding, or 1.
In order to prevent thermal imbalance of M, each 1. I want to avoid giving it to H.

For this purpose, each 1. Torque (or current) of M
is detected, and this controls the total current so that it does not exceed a certain value (Ideally, we would like to control only the current of 1.M that exceeds a certain value, but it is possible to control multiple 1.M units at the same time. This is achieved by

〔Example〕

An example is shown in FIG.

1 is a current pattern generation section, and the pattern value Io to be controlled is
This is to set p. This Iop and the total current Io of the plurality of motors are detected by the DCCT 4, and the control device 2 controls the voltage V and frequency F applied to the VVVF inverter main circuit 3 based on the deviation between Iop and Io.

At this time, the current detection circuit 5 of each motor detects the currents Ii to I4 of each motor, and these currents are set to current setting values rzmax to I411 corresponding to the preset adhesion.
It is controlled so that it does not exceed 1aX. That is, I xm
When It~Ia exceeds ax~I4ynax, the deviation is detected by the low-order priority circuit 7, and under the condition that the polarity is negative (Iwax exceeded), the value of Δwork0 is subtracted, and Io
11~I4 decreases the value of Izmax~Iam
Control is performed so that the value of ax is not exceeded.

According to this embodiment, even if the wheel diameters of IM1 to IM4 are different, the generated torque of the shaft that generates the maximum torque (the maximum wheel diameter) can be controlled within the adhesion limit, and the maximum traction force can be controlled most efficiently. can be obtained.

〔Effect of the invention〕

According to the present invention, when an induction motor having different wheel diameters is controlled by one control device, it is possible to control the induction motor within the maximum adhesion force that can be used most efficiently. Furthermore, the maximum loss of the induction motor can be limited, and the size of the motor can be reduced.

[Brief explanation of the drawing]

The figure is a block diagram of one embodiment of the present invention. 1... Current pattern generation, 2... Control section, 3...
VVVF inverter main circuit.

Claims (1)

[Claims] 1. In a vehicle control device that detects and controls the total current of a plurality of traction motors according to a set total current pattern, detecting the current loaded on each of the traction motors; A vehicle control method characterized by reducing the total amount of current when the calculated traction force exceeds the expected adhesive force. 2. A vehicle control method according to claim 1, characterized in that the torque pattern of each of the main electric motors is individually set.