JPS6192102A - Readhesion controller of electric railcar - Google Patents

Abstract

PURPOSE:To effectively readhere an electric railcar by reducing a main motor current to the prescribed value for the prescribed time in response to the speed at slipping or sliding time. CONSTITUTION:A slip signal is input to a slip calculator 12, and the calculated result is applied as a negative deviation to the command value of a main motor current IMM. The result is applied to a gate 8 to control a conduction rate. In other words, if wheels slip at a slipping speed V1 at a time t1, the conduction rate of a chopper is reduced in accordance with a gate command to reduce the current IMM. The reducing amount DELTAIMM1 at this time is selected to become IMM1proportional V1. Further, the reducing time DELTAt1 is selected to become DELTAt1proportional V1. Thus, the readhesion is effectively performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a readhesion control device for an electric vehicle, and more particularly to a chopper control device that detects the voltage of a main motor and performs readhesion control.

The prior art will be explained by taking an armature chopper control device as an example.

FIG. 1 shows the main circuit configuration of the armature chopper control device (hereinafter abbreviated as chopper device) when the armature chopper control device is in operation.

When an ON command is given to the chop section 7 from the gate control circuit (hereinafter referred to as gate) 10, the main motor current changes to the power source 1.
From filter reactor 2 and filter capacitor 3
The energy flows to the main motors 4, 5 and the main smoothing reactor 6 through the filter, and increases while storing energy in the reactor.

Next, when an OFF command is issued from the gate 8, the chop section 7 goes to OFFL, and the main motor current flows through the freewheeling diode 9 circuit and attenuates due to the stored energy.

By repeating this ON/OFF operation, the average value of the traction motor current (hereinafter abbreviated as traction motor current), that is, the torque of the traction motor is controlled.

The best way to detect wheel slippage is to directly detect the speed of a wheel using a speed generator and compare it with the speed of other wheels. It is common to detect

After the slip is detected, control is performed to change the throttle of the traction motor current according to the slip acceleration (rate of increase in the traction motor voltage) or the idling speed (the traction motor voltage).

Part A of FIG. 1 shows a slip detection circuit consisting of a bridge resistor 10 and DCPT II when two main motors are connected in series per main circuit group.

When the wheels are not idling, the back electromotive forces Esz and EMz of the traction motors 4 and 5 are approximately the same value, and the DCPTII that detects the traction engine difference voltage ΔEM (= l EMI - EMzl) outputs do not.

However, when one wheel spins, a difference occurs in the back electromotive force between the traction motors, and the traction engine differential voltage ΔE becomes DCPTII.
is detected, and under the conditions of dΔEM/dt≧Kt (set value) or ΔEM≧Kz (set value), the chop section 7 performs control to narrow down the main motor current according to the command from the gate 8.

The disadvantage of this method is that since the conduction rate of the chop section 7 during idling is reduced, the main electric engine differential voltage ΔEM is also small, and even in a state where there is no readhesion (idling does not stop completely), dΔEM / d t <Kx Or ΔEM<Kz. As a result, the chop section 7
increases the conduction rate and controls the traction motor current to return it to a predetermined level. This situation is shown in FIG.

When idling starts at time tx, a voltage appears in the traction engine differential voltage ΔE, and the traction motor current INN is narrowed down from 0 time t2, since the traction engine differential voltage ΔEM becomes small.
Although the traction motor current IMM attempts to return to a predetermined level, the traction motor torque increases while a slight idling ΔV remains, causing idling again at time t8.

If the condition of the track, such as a rail, is not good, once slipping occurs, the state of not re-sticking may continue indefinitely as described above. If this happens, not only will the utilization coefficient decrease, but it will also cause problems in terms of operation management, such as the inability to maintain the scheduled speed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control method for an electric vehicle that remembers whether the vehicle has skidded or skids and reliably performs re-adhesion.

The feature of the present invention is that the traction motor current is narrowed down to a constant value for a certain period of time according to the speed during slipping or skidding, and then,
The point is to return it to a predetermined level.

An embodiment of the present invention will be described based on the drawings.

FIG. 3 is a control block diagram showing a readhesion control method during idling according to an embodiment of the present invention.

The idling signal is taken into the idling calculation circuit 12, and the calculated result is given as a negative deviation to the command value of the main motor current IMH. The result is given to the gate 8 to control the conduction rate.

FIG. 4 is a readhesion control characteristic diagram of the present invention.

That is, if the wheels are idling at the idling speed v1 at time 11, the conduction rate of the chop portion is reduced to narrow down the main motor current IMM in accordance with the gate command.

The aperture amount ΔIs+t at this time is selected to be 4114M1Ccv1, and the constant time Δtz (=ts ts)
After that, the traction motor current I
Control is performed to return M to a predetermined level.

The narrowing down time Δ11 is also selected to be ΔtlQ:Vl. 1 for ΔIN. Both Δt1 are calculated and determined by a slip calculation circuit.

When the idle speed is small 1 For example, in the case of v2,
The main motor current throttling amount ΔI MMZ and the throttling time Δtz (=t4−tz) are also reduced.

By doing this, the traction motor torque is reduced until the idling stops, and re-adhesion can be ensured.6 Also, since the amount of throttling of the traction motor current is changed depending on the idling speed, the traction motor torque is reduced unnecessarily. There is no need to reduce torque, and the utilization coefficient of adhesion can be improved.

The same thing can also be done when gliding.

According to the present invention, even when the condition of tracks such as rails is poor,
In order to suppress the traction motor torque to a constant value for a certain period of time depending on the fact that the motor is idling and the idling speed at that time,
It can be reattached reliably. Furthermore, there is an effect that the utilization adhesive coefficient can be improved.

[Brief explanation of the drawing]

Fig. 1 is a main circuit configuration diagram of the chopper device when moving, Fig. 2 is a conventional readhesion control characteristic diagram, Fig. 3 is a block diagram of readhesion control showing an embodiment of the present invention, and Fig. 4 is a readhesion control characteristic diagram of the present invention. 1...Power supply, 2...Filter reactor, 3...
Filter capacitor, 4, 5... Main motor, 6...
Main smoothing reactor, 7...Chop part, 8...Gate, 9...Freewheeling diode, 10...
・Bridge resistance, 11...DCPT, 12...Idle operation circuit, EMiEM2...Main motor counter electromotive force, Main motor current, ΔIMMIIΔI MMz...
・Train motor current throttling amount, ΔEM...Train motor counter electromotive force, V, Vl 1 Vl...Idle speed, ΔV...Minor idle speed, t...Time, Δ11. Δt2...Narrowing down time, tl, ts, ta, ts". Time.

Claims (1)

[Claims] 1. A traction motor, a slipping/skidding detector for detecting whether wheels driven by the traction motor are slipping or skidding, and a control device for controlling the torque of the traction motor based on a signal from the detector; An electric vehicle in which the speed or acceleration of slipping or skidding of the wheels driven by an electric motor is detected by the slipping/slipping detector, and the torque of the main motor is reduced by the control device to perform readhesion control, wherein the torque is reduced. A re-adhesion control device for an electric vehicle, characterized in that the torque reduction amount and the reduction time are made proportional to the slipping/sliding speed, and the torque reduction amount is kept constant during the reduction time.