JPH05316611A - Readherence controller for electric railcar - Google Patents

Abstract

PURPOSE:To avoid an unnecessary readherence operation by preventing an erroneous detection of slipping, sliding of a power concentration electric railcar such as a locomotive, etc., at the time of operating a light load (single railcar). CONSTITUTION:A slip/slide detector 9 decides a slip/slide if a magnitude of an acceleration from an acceleration/deceleration detector 8 becomes a set value A or more, sends a control signal for reducing a current to a current pattern generator 2 and sends an operation signal to a sander 10. The smaller is an output command value (lighter load) from an output instruction unit 1. The larger the value A output from a slip/slide detection reference value generator 21 is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a re-adhesion control device employed in, for example, an electric vehicle of a power concentration type in which a plurality of freight cars are towed by a locomotive.

[0002]

2. Description of the Related Art FIG. 3 is a conventional re-adhesion control device of this kind described in, for example, "8. VVVF Inverter Drive Control Re-adhesion Control for Electric Locomotives", Proc. It is a circuit block diagram showing. In the figure, 1 is an output commander that generates an output command value that is set according to the magnitude of the load by a driver or the like, and 2 is an output commander 1.
Pattern generator for inputting an output command value from the motor and outputting a current pattern, 3 is a current calculator for comparing and amplifying the current pattern and the current of the induction motor 6 to be described later, and 4 is a DC power source from the overhead wire A PWM inverter that generates an AC output according to a control signal from the calculation unit 3, 5 is a current detector that detects the current of the induction motor 6, 6 is an induction motor as a rotation drive unit, and 7 is the rotation speed of the induction motor 6. Is a speed detector that detects the acceleration, 8 is an acceleration / deceleration detector that differentiates the signal from the speed detector 7 to generate acceleration / deceleration, and 9 is a signal that compares the signal from the acceleration / deceleration detector 8 with a predetermined set value A. A slipping detector 10 for detecting slipping by means of a slipping device for re-adhesion.

Next, the operation will be described. When the driver sets an output command value such as torque or current with the output command device 1, the command value is input to the current pattern generator 2, and the output is further input to the induction motor 6 in the current calculator 3.
The output frequency and voltage of the inverter are determined by comparison with the current of the inverter. The PWM inverter 4 supplies the AC output of the determined frequency and voltage to the induction motor 6 to control its speed.

Here, for example, when slipping occurs during acceleration of the vehicle, the rotational speed of the induction motor 6 rapidly increases, so that the output of the acceleration / deceleration detector 8 increases. When the output from the acceleration / deceleration detector 8 exceeds the set value A, the slipping detector 9 determines that slipping has occurred and reduces the output to the current pattern generator 2, that is, sends a control signal for narrowing the current. At the same time, a signal is sent to the sand spreader 10. This causes the sand spreader 10 to operate and spread sand on the rails to re-stick the wheels.

[0005]

Since the conventional re-adhesion control device is constructed as described above, when the load is small such as when the locomotive is operating alone or when the load to be pulled is small, the rated load is Acceleration / deceleration is increased compared with time, and sometimes the slipping detector 9 operates to perform an unnecessary operation such as current narrowing or sanding even though slipping actually does not occur. There was a problem.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a readhesion control device that does not erroneously detect slipping slip regardless of the magnitude of the load.

[0007]

The re-adhesion control device for an electric vehicle according to the present invention increases the set value for determining the occurrence of slipping as the output command value set according to the load decreases. It was done.

[0008]

When the load is small, the acceleration / deceleration at normal times when idling does not occur becomes large, but the set value for slipping slip detection is also increased, so erroneous detection is prevented.

[0009]

EXAMPLES Example 1. 1 is a circuit configuration diagram showing a readhesion control device for an electric vehicle according to a first embodiment of the present invention. In the figure, the same parts as those of the related art are designated by the same reference numerals and the description thereof will be omitted. Reference numeral 21 denotes a slipping slip detection reference value generator newly added in the present invention, which inputs the output command value from the output command device 1 and sends a signal of the set value A to the slipping slip detector 9.

Next, the operation will be described. The driver sets the output command value from the output commander 1 to a small value when the locomotive is operating as a single unit or when the number of freight cars to be towed is small. When receiving the output command value from the output command device 1,
Each of the elements below the current pattern generator 2 performs the constant current control operation similar to that described above, but the acceleration becomes high due to the light load. Therefore, in the past, there was a case where the slip detection was erroneously detected, but in the embodiment of the present invention, the detection set value A is changed according to the output command value, so that the erroneous detection is prevented. It

That is, the slipping detection reference value generator 2 shown in FIG.
As indicated by the characteristic curve in the block 1, when the output command value (horizontal axis) from the output commander 1 decreases, the set value A (vertical axis) increases in inverse proportion to it. Therefore,
Even if the load is light and the acceleration is large, the set value A, which is the reference for determining the slipping motion by the slipping motion detector 9, is set to a large value accordingly, so erroneous judgment is avoided and sanding etc. Unnecessary operation is prevented. Further, since the operation of narrowing down the current is also avoided, smooth starting and acceleration characteristics can be obtained at high acceleration.

Example 2. In the slipping slipping detection reference value generator 21 of the first embodiment, the set value A sent to the slipping slipping detector 9 has a continuous characteristic that is inversely proportional to the output command value input from the output commanding device 1. It is assumed that Figure 2
It may be a stepped one as shown in FIG. That is, the switching device 22 that operates by discriminating the magnitude of the output command value is provided,
When the output command value is equal to or greater than the predetermined switching reference value, the large output reference value A1 side is selected and is sent to the slipping slip detector 9 as the set value A, and when the output command value is less than the predetermined switching reference value. Selects the small output reference value A2 side larger than A1 above,
This is sent to the slipping slip detector 9 as a set value A.

Embodiment 3. Further, in each of the above embodiments, the set value A when the slipping detector 9 detects slipping is directly changed based on the magnitude of the output command value, but the gain of the acceleration / deceleration detector 8 is output. It may be changed based on the magnitude of the command value. That is, when the output command value is small, the gain of the acceleration / deceleration detector 8 is lowered to decrease the value of the acceleration sent to the slipping slip detector 9. Also in this case, this substantially corresponds to raising the detection level of slipping, and is equivalent to increasing the set value A of the slipping detector 9. Therefore, the present invention includes such an embodiment in its scope.

Example 4. Further, in each of the above-mentioned embodiments, only slipping during acceleration of the vehicle has been described. However, even when deceleration due to braking, if the absolute value of the deceleration increases, slipping may occur, so the present invention adopts the above configuration By doing so, even when decelerating, the same effect as described above of preventing erroneous detection of idling can be obtained.

Example 5. In the above embodiment, the rotational speed of the induction motor 6 is detected to obtain the acceleration / deceleration, but the rotational speed of the wheel shaft may be detected to obtain the acceleration / deceleration from this. In addition, as a drive system for electric vehicles, P
The invention is not limited to the combination of the WM inverter and the induction motor, and is not limited to the electric power intensive electric vehicle.

[0016]

As described above, according to the present invention, the set value for determining the occurrence of slipping slip is increased as the output command value becomes smaller. Therefore, it is possible to prevent the false detection of slipping slip due to the reduction of the load. You can

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing a readhesion control device for an electric vehicle according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram showing a main part of a readhesion control device according to a second embodiment of the present invention.

FIG. 3 is a circuit configuration diagram showing a conventional readhesion control device for an electric vehicle.

[Explanation of symbols]

 1 Output command device 2 Current pattern generator 3 Current calculation unit 4 PWM inverter 5 Current detector 6 Induction motor 7 Speed detector 8 Acceleration / deceleration detector 9 Idling slip detector 21 Idling slip detection reference value generator

Claims (1)

[Claims] 1. An electric vehicle which detects the number of rotations of a rotation drive unit, determines that slipping has occurred when a differential value of the number of rotations exceeds a predetermined set value, and performs a predetermined readhesion control operation. In the re-adhesion control device, the set value is increased to determine the occurrence of slipping as the output command value set according to the load becomes smaller. Adhesion control device.