JPH01231609A - Control of electric rolling stock - Google Patents

Abstract

PURPOSE:To realize an optimum readherence control agreed with a weather state change by controlling a driving current from a current pattern signal designated by a readherence control current pattern corresponding to a weather state. CONSTITUTION:A signal representing a weather state of a district where an electric railcar is traveled is input from a weather state input unit 21 to a memory 20 during its traveling. The memory 20 selects a control parameter on the basis of this signal. After the parameter 22 is selected, a current pattern generator 10 stands by. When an idle/slide detector 17 applies an idle/slide signal to the generator 10 at the time of waiting state, the generator 10 applies a current pattern signal 12 to a comparator 13. Then, the driving current value of a motor 11 is controlled on the basis of the signal 12. Thus, the drive wheels and rails can be rapidly returned to an adhesive state even in any weather state.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides a system for re-adhering the drive wheels to the rails when the drive wheels of an electric vehicle propelled by an electric motor slip or slide between the rails. The present invention relates to a method of controlling an electric vehicle.

(Prior Art) The drive wheels of an electric vehicle propel the vehicle based on the adhesive force between them and the rail. At this time, the drive wheel idles on the rail when the rotational force of the drive wheel is greater than the adhesive force and when the rotational force is smaller than the adhesive force. This idle rotation of the drive wheels significantly reduces the propulsion force of the vehicle. When this spin occurs while the drive wheels are driving, it is called "slip," and when the drive wheels slip while the drive wheels are braking, it is called "skidding."
It is called. Now, the viscous force F of the driving wheel is 4, where μ is the adhesive coefficient and W is the weight applied to the driving wheel. The adhesion coefficient μ is not constant, but varies depending on conditions such as rain, snowfall, and frost, and it is well known that the adhesion coefficient μ under the above conditions is generally smaller than when the rail is dry on a sunny day. Even in the case of rainfall, the adhesion coefficient changes depending on the amount of rain, and it is also well known that the adhesion coefficient differs between when it starts raining and after some time has passed since it started raining.

The same applies in the case of snowfall. When the adhesive coefficient decreases, the adhesive force F decreases as shown in the above equation, so when the adhesive force F becomes smaller than the rotational force, the drive wheel will idle on the rail. In addition, although only the case of idling was explained above, when the adhesive force F becomes smaller than the braking force,
The drive wheels slide on rails. In the case of skidding, the same condition as explained above for slipping occurs, so the explanation thereof will be omitted.

When the drive wheels idle, the rotational force of the drive wheels cannot sufficiently propel the vehicle, causing problems such as separation of the drive wheel treads, burnout of the drive wheel bearings, and rail fatigue and friction. Therefore, when the drive wheel becomes idling, it is necessary to quickly recover the drive wheel from the idling state and return the adhesive state between the drive wheel and the rail to the normal state. That is, it is necessary to control readhesion. Even if the drive wheels slip, it is necessary to quickly return them to their normal adhesion state.

An example of readhesion control performed when the above-mentioned slipping and skidding occurs is shown in FIG. 4. This example is a general circuit configuration diagram showing a motor drive system used to propel the electric motor 11. In the figure, a current pattern generator 10 is a current pattern signal for controlling the torque of the electric motor 11. 12 and outputs this current pattern signal 12 to a comparator 13.The comparator 13 calculates the deviation value between the received current pattern signal 12 and the drive current of the motor 11 detected by the current detector]4. Then, this deviation value is given to the current controller 15.

When the current controller 15 receives the deviation value from the comparator 13, it adjusts the current pattern signal 12 so that this deviation value becomes zero based on control theory, and provides this current pattern signal 12 to the power converter 16. Power converter 16 controls the drive current of electric motor 11 based on current pattern signal 12 .

In the above example, when performing readhesion control, the current pattern signal 12 is the drive current value of the electric motor 11 rotating from point a to point b, as shown in FIG. If this occurs, the slipping/skidding detector 17 detects the slipping condition based on control theory. Upon this slip detection, the current pattern generator 10 supplies a current pattern signal 12 for readhesion control to the comparator 13. This current pattern signal 12 lowers the drive current value before idling to 50%. In this way, readhesion is measured by rapidly decreasing the current pattern signal 12 from point b to point 0. 0 while the slipping/skidding detector 17 detects slipping.
The drive current value is maintained at a value of 50% as shown from point to point d. The times of this 0 point and d point can be freely selected to ensure readhesion. After this, the current pattern signal 12 gradually increases from point d to point e. Then, the drive current value of the current pattern signal 12 returns to 90% of the normal value as shown from point e to point f. This current pattern signal 12 with a driving current value of 90% is maintained for a period of time from point e to point f, and if slipping does not occur again during this period, the driving current returns to the value before the slipping occurred.

(Problem to be Solved by the Invention) However, in the conventional re-adhesion control method as described above, the current pattern signal for re-adhering the driving wheels is not changed or modified according to weather conditions, but the current pattern signal is independent of weather conditions. Therefore, this current pattern signal is not necessarily suitable for the adhesive coefficient of the rail surface. In other words, this readhesion control method is not suitable for weather changes.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a control method for an electric vehicle that can perform optimal readhesion control in response to changes in weather conditions.

[Structure of the invention]

(Means for Solving the Problem) In order to achieve the above object, the present invention controls the drive current of the drive wheel according to a current pattern for re-steering control when the drive wheel spins or slides on the rail. In a control method for an electric car that returns the driving wheels to a state of adhesion with the rail by Re-adhesion control that inputs local weather conditions, detects when the drive wheels spin or skid on the rails while driving an electric vehicle, and responds to the input weather conditions when this detection occurs. The method is to select a current pattern for use and control the drive current based on this current pattern signal.

(Function) In the electric vehicle control method according to the present invention as described above, the weather conditions of the area where the train is running are input, and when the drive wheels are detected to be slipping or sliding on the rails while the electric vehicle is operating, ,
The drive current is controlled by a current pattern signal instructed by a readhesion control current pattern corresponding to the weather condition. By controlling the drive current, readhesion between the drive wheels and the rail is controlled.

(Example) An example of the electric vehicle control method of the present invention will be described below based on the drawings. FIG. 1 shows a control device 18 and an electric motor 1 for carrying out a method of controlling an electric vehicle. In addition,
Since the configuration of the control device 18 shown in FIG. 1 is the same as that already explained in the section of the prior art based on FIG. 4, the same reference numerals are given to the configuration. This control device 18 is mainly composed of a microcomputer 19. Storage section 2 in the microcomputer 19
0 is connected to a weather condition input section 21. In this weather condition manual section 21, switches are arranged for each weather, ie, for each weather such as clear skies, rain, evening, etc. By closing this switch, a signal is given to the storage section 20 in the microcomputer 19. The storage unit 20 stores a plurality of control parameters 22 as shown in FIG.

This control parameter 22 consists of a reference number, weather, an attribute as weather information, an attribute 2, and a current pattern name as current pattern information. A reference number is assigned to each control parameter 22, and when the weather is specified from the weather condition input section 21, one of the control parameters 22 is selected. Weather has names such as sunny, rainy, and snowy. Attribute 1 is a change in weather indicated by the weather, and is a classification of rainfall conditions according to temporal changes. Attribute 2 is also a change in weather indicated by the weather, and is a classification of rainfall conditions, excluding clear skies, according to quantitative changes. The current pattern name will be described in detail later, but it indicates a reference code indicating the current pattern signal 12 shown in FIG. In this way, the signal given to the storage section 20 from the weather condition input section 21 is transmitted to the plurality of control parameters 2 stored in the storage section 20.
It is designed to indicate one of the two reference numbers.

The current pattern generator 10 generates a current pattern signal 1 according to each current pattern name included in the control parameter 22.
form 2. Current pattern signal]2 is a signal for controlling the drive current of electric motor]1. Each current pattern signal 12 is indicated by the current pattern name of the control parameter 22 stored in the storage section 20, as shown in FIG. Each current pattern signal 12 has a drive current shown from point a to point b before the wheel slips or skids, and a drive current from point b to point 0 that rapidly decreases due to the occurrence of slip or skid. , from point 0 to d, which lasts for a predetermined period of time while slipping or skidding occurs.
It is generally formed by the drive current at the point and the drive current from point d to point e, which gradually increases after a predetermined time has elapsed. Next, the characteristics of each current pattern signal 12 will be explained.

In the case of the current pattern signal 12 shown in FIG. 3(a), the drop in the drive current from point b, which rapidly falls, to point 0 is small, and the drive current value from point d, which rises slowly, to point e, slips or slides. This becomes the same value as the previous drive current value from point a to point b.

In the case shown in FIG. 3(b), there are two stages from point d to point e and from point e to point f to return to the drive current value before idling or skidding.

In the case shown in Fig. 3 (C), the drop in drive current from point b to point 0 is large, and when returning gently from point d to point e, the drive current value is lower than the drive current value before slipping or skidding occurs. Return to

In the case shown in Figure 3(d), the drop in drive current from point b to point 0 is even larger (, the duration from point 0 to point d is long,
When returning slowly from point to point e, the drive current value returns to a lower value than the drive current value before slipping or skidding occurred. This case is suitable for readhesion control in very slippery weather conditions.

It should be noted that each of the current pattern signals 12 described above is only a part of the diagram, and it goes without saying that many other current pattern signals 12 may be formed depending on the weather conditions.

Each of the current pattern signals 12 as described above is provided from the current pattern generating section 10 to the comparator 13. That is, when the slipping/skidding detector 17 detects an abnormal rotation state of the electric motor 11 through the interface circuit 23, or when it detects slipping or skidding by comparing the rotational speed of the drive wheel and other wheels, etc. A slip/slip detector 17 provides a slip/slip signal to a current pattern generator 10, and a current pattern signal 12 is provided from the current pattern generator 10 to a comparator 13. The comparator 13 receives the drive current value shown in the received current pattern 13 No. 12 and the current detector 14
The deviation value from the drive current value detected by the controller 1 and the drive current value given through the interface circuit 24 is calculated, and this deviation value is given to the current controller 15. The current controller 15 is the comparator 13
Upon receiving the deviation value from the current pattern signal 12, the current controller 15 adjusts the current pattern signal 12 so that the deviation value becomes zero. That is,
The current controller 15 calculates drive current values from point a to point b, which represent the drive current value at which the motor 11 is currently rotating, out of the current pattern signal 12 shown in FIG.

This current pattern signal 12 is transmitted to the microcomputer 19
is applied to the power converter 16 through an interface circuit 25 connected to the power converter 16 . The power converter 16 controls the drive current value of the motor 11 according to the current pattern signal 12.

Furthermore, a method for controlling an electric vehicle according to the present invention will be specifically explained. While the electric car is running, a signal indicating the weather condition of the area in which it is running is sent from the weather condition input section 21 to the storage section 20.
is man-powered. If this signal is the reference number 1 of the control parameters 22, the storage unit 20 stores the reference number 1.
control parameters 22 are selected. As shown in FIG. 2, the control parameter 22 with reference number 1 is set when the weather is clear and
attribute] is within 30 minutes after rain, and the current pattern name is B.
It is. After the control parameters 22 are selected in this manner, the current pattern generator 10 waits. When the drive wheel slips or skids during this standby state, the slip/slip detector 17 sends a slip/slip signal to the current pattern generator 1.
given to 0.

The current pattern generator 10 generates a current pattern signal 12 corresponding to the current pattern name B based on this slipping/sliding signal, and supplies this current pattern signal 12 to the comparator 13.

After this, the drive current value of the motor 11 is controlled based on the current pattern signal 12 designated by the current pattern name B as described above. That is, as shown in FIG. 3, the drive current rapidly decreases from point b to point 0, and the rotational speed of the drive wheel decreases, so that the drive wheel and the rail re-adhere. 0
The drive current value is small between point and point d, and slipping or skidding stops during this period. After idling or skidding has stopped, the drive current is gradually increased from point d to point e,
Adjust this drive current value to prevent slipping or skidding from occurring again.
After continuing from point f to point f, the drive current value is returned to the original value from point f. In this way, if the drive wheels spin or slide, they are quickly reattached to the rails depending on the weather conditions. In other weather conditions, for example, rain, the readhesion state is restored through the same control sequence as above.

In the above embodiment, the weather selection is manually input from the weather condition input section 21.
When the operation of electric vehicles is centrally controlled and managed, the weather conditions in the area where the electric vehicles are traveling can be detected in advance, so the weather condition input section 21 receives signals from the central control room rather than manually. The control parameters 22 stored in the storage unit 20 can be automatically selected.

〔Effect of the invention〕

As described above, in the electric vehicle control method according to the present invention, a plurality of readhesion control current patterns are prepared depending on the weather conditions, and the weather conditions of the region where the electric vehicle is driven are input. When the drive wheel spins or slides on the rail during operation of an electric vehicle, the drive current of the drive wheel is controlled by a current pattern signal instructed by a readhesion control current pattern corresponding to the weather condition. When the drive wheel spins or slides on the rail, the drive wheel and the rail can be quickly returned to an adhesive state according to the weather conditions at that time, no matter what the weather condition is. Therefore, an optimal adhesion control method can be realized.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing a control device for carrying out the electric vehicle control method of the present invention, FIG. 2 is an explanatory diagram of stored contents of control parameters, and FIG. 3 is a waveform diagram showing a current pattern signal. FIG. 4 is a circuit diagram showing a conventional readhesion control device;
FIG. 5 is a waveform diagram showing a conventional current pattern signal. 11... Electric motor, 12... Current pattern signal, 22
...Control parameters. Applicant's agent Mr. Sato LJ Figure 4 Figure 3

Claims (1)

[Claims] An electric vehicle control method for returning the drive wheel to a state of adhesion to the rail by controlling the drive current of the drive wheel according to a re-adhesion control current pattern when the drive wheel slips or slides on the rail. In this step, a plurality of readhesion control current patterns are prepared according to weather conditions, and when the electric car is operated, the weather conditions of the area where the electric car is driven are input, and the driving wheels are adjusted while the electric car is being operated. detects that the rail is slipping or skidding on the rail, selects a current pattern for re-adhesion control that corresponds to the input weather condition when this detection is made, and based on this current pattern signal, the A method for controlling an electric vehicle, the method comprising controlling a drive current.