JPS61189101A - Controlling method of regenerative brake for electric railcar - Google Patents

Abstract

PURPOSE:To improve readhesive characteristic by securing a field current when a slip detector operates and eliminate the operation of a auxiliary air brake. CONSTITUTION:A comparator 2 compares the output value of a regenerative brake calculator 1 with a command general brake force BEO and produces a command to a supplementary brake controller 3 when a regenerative brake force is insufficient. When a slide/adhere detector 5 operates, a main circuit is disconnected to turn once OFF a regenerative brake current, and to cut a command to the controller 3. Thus, even if a slip occurs during a regenerative brake, a readhere can be rapidly recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a regenerative brake control method for an electric vehicle that uses a DC motor and includes means for controlling its field current to perform regenerative braking.

[Conventional technology]

Conventionally, in electric vehicles that perform regenerative braking by using a series-wound motor or a compound-wound motor and controlling its field current with a separate field control device, the overall braking force has been adjusted in consideration of failure or insufficient regenerative braking. To prevent this from decreasing, it is common to use supplementary air brakes.

However, during regenerative braking, if a small part of one unit slides, the overall braking force will decrease, so the field control device works to increase the field current to maintain the braking force, and further brake Insufficient force will result in supplementary air brake activation.

[Problem that the invention seeks to solve]

However, in this case, an excessive braking force will be generated on the axes that are not slipping, and these axes will also be more likely to slip.

Furthermore, since the braking force on the sliding shaft does not disappear at P3, it is difficult for the shaft to re-stick. In order to eliminate these drawbacks, conventionally a skid detection device was installed, and when this skid detection device was activated, the main circuit was disconnected.
Generally, the regenerative brake current is turned OFF, and the circuit is reconfigured after being allowed to reattach. However, even with this method, since the electric brake force is temporarily lost, the supplementary air brake will start up, and when the electric brake starts up again, the attenuation of the supplementary air brake will be delayed compared to the rise of the electric brake force, so during this time However, there was a problem in which the brake force was too high and the plane skidded again.

This also caused problems such as flat wheels and poor ride comfort.

SUMMARY OF THE INVENTION An object of the present invention is to provide a regenerative braking control method for an electric vehicle that solves the problems of the prior art described above and allows quick re-adhesion even if skidding occurs during regenerative braking.

[Means for solving problems]

To achieve this objective, the present invention provides that, when the skid detection device is activated, the field control device fixes the field current to the value at which the skid detection device was activated, and a supplementary air brake is activated. Try not to.

[Effect]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an overview 1 of the present invention will be explained with reference to the drawings. Figure 2 is a simplified connection diagram of the main circuit using a compound-wound motor, where 6 and 7.8 are the armatures, series-wound field, and shunt-wound field of a plurality of compound-wound motors, respectively, and 9 is the field chain. Sonotsuba device, 10
is a pantograph.

The field current I is controlled by a field current blower device 9. Fig. 3 is a characteristic curve diagram showing a notch curve during regenerative braking. C is a case where the field current is small.When the deceleration is constant, the field is controlled so that the armature current disappears as shown by the curved line of the broken line.In other words, when the speed is high, the field current If is small. ,
The field current I7 is controlled to increase as the speed decreases.

Now, if the vehicle skids at a certain speed point E on the diagram, the braking force will decrease due to skidding with a conventional control device, so
In order to compensate for this, it operates to strengthen the field current If. If the field is further strengthened to the maximum, the regenerative braking current will not be applied any more, so the supplementary air brake will operate, causing the above-mentioned problem. The present invention is characterized in that when the skidding detection is activated, the field current If is fixed at the value at that time, and the supplementary brake is not activated.

In other words, by doing this, as you can see from the notch curve in Figure 3, the field current If is kept at a certain value, so when the speed decreases due to sliding as shown in curve B, the brake current IB automatically increases. As the brake force decreases at the same time, it re-sticks.

Also, at this time, the supplementary air brake is normally activated because the overall braking force is insufficient, but this makes it difficult to re-stick, so if the skid detection device is activated, the supplementary air brake will not be activated. to improve re-adhesion performance.

〔Example〕

FIG. 1 is a configuration diagram showing one embodiment of the present invention, in which 1 is a regenerative brake calculator, 2 is a comparator, 3 is a supplementary brake controller, 4 is a brake cylinder, and 5 is a skid sticking detector. , these are connected and arranged as shown. BEO is the required commanded total braking force, IA is the armature current of the motor, and If is the field current.

In the figure, a regenerative brake calculator 1 calculates regenerative braking force and generates the calculation result on the output side. The comparator 2 compares the output value of the regenerative brake calculator 1 with the commanded total braking force BEO, and issues a command to the supplementary brake controller 3 if the regenerative braking force is insufficient. When a finger ◆ is given to the supplementary brake controller 3, air is supplied to the brake cylinder 4 using the electromagnetic supply/discharge valve in the supplementary brake controller or an analog control valve to obtain the required air pressure. When the skid/fixation detector 5 is activated, the finger ◆ to the auxiliary brake controller 3 is cut off.

〔Effect of the invention〕

As described above, according to the present invention, when the skid detection operates at P7, the field current is fixed and the supplementary air brake is not activated, which improves the readhesion property and improves the riding comfort of the electric vehicle. This has the effect of making wheel treads less likely to flatten.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a simplified main circuit connection diagram when a compound motor is used, and FIG. 3 is a diagram showing a notch curve during regenerative braking. l...Regenerative brake calculator, 2...Comparator,
3...Supplementary brake controller, 4...Brake cylinder, 5...Sliding sticking detector, BEO・
... Commanded total brake force, 6 ... Armature, 7
...Shunt winding field, 8...Series winding field, 9...
・・Field magnetic tip four collar device, 10・・・・・Pantograph.

Claims (1)

[Claims] Regenerative braking is performed by using a DC motor and its field control is performed by a field control device that is different from the control device that controls the armature current, and the regenerative brake fails and the braking force is lost or the regenerative brake is insufficient. The regenerative brake control device is configured to operate a supplementary air brake when the skid detection is activated, and when the means is activated, the field control device causes the field current to be set to the value at the time the skid detection was activated. Along with fixing
A regenerative braking control method for an electric vehicle, comprising disabling the supplementary air brake.