JP3532425B2 - Electric vehicle idling control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idling control device for an electric vehicle.

[0002]

2. Description of the Related Art Generally, a main circuit of an electric vehicle driven by a three-phase induction motor is constructed as shown in FIG.

That is, the DC overhead wire 1 to the pantograph 2
The DC power collected via the
reaker) 3, charging resistor 41 and charging capacitor 4
It is supplied to the VVVF inverter 6 through the parallel circuit of No. 1 and the filter reactor 5 in sequence, converted into AC power by variable voltage variable frequency control, and then supplied to the drive motor 7 including a three-phase induction motor.

The VVVF inverter 6 is composed of, for example, a three-phase bridge circuit made of a self-extinguishing type semiconductor device such as a GTO thyristor or an IGBT, and is generated based on a speed command from a driver's cab 8 and a motor rotation speed from a speed sensor 9. The conduction / non-conduction control is performed by the pulse width modulation (PWM) signal from the speed controller 10.

The rotating torque of the drive motor 7 is transmitted to the wheels 11, and the electric vehicle propulsively travels by obtaining a frictional force (hereinafter referred to as an adhesive force) between the wheels 11 and the rail 12.

The adhesive force between the wheel 11 and the rail 12 is
It changes depending on the state of the surface of the rail 12 and, for example, if the rail 12 gets wet with rain, is covered with snow or ice, or has fallen leaves or oils attached, the adhesive force decreases.

When an adhesive force exceeding the tensile force is formed between the wheel 11 and the rail 12, the tensile force due to the rotation of the wheel 11 becomes the traveling propulsive force of the electric vehicle as it is. As shown, if the tensile force (T) of the wheel 11 exceeds the adhesive force (μW), the excess tensile force causes the wheel 11 to idle and rotate at a speed higher than the traveling speed of the vehicle body. .

T> μW formula (1) where T: tensile force of the wheel 11 μ: adhesion coefficient W: vehicle mass Therefore, if the adhesion force decreases due to, for example, an upslope and the wheel 11 spins, the electric vehicle will move uphill. Can't climb up and get stuck.
Further, if the wheel 11 continues to rotate idly, the surface of the wheel 11 contacting the rail 12 may be separated, or the rail 12 may cause frictional fatigue.

[0009] Conventionally, therefore, the crew member of the electric vehicle, when detecting the idling of the wheel, tries to re-adhere by controlling the rotation of the drive motor 7 by the current diaphragm, and attaches it to the bogie frame by the sand-dispersing command from the driver's cab 8 by the crew member. The sand (adhesive) in the sand duster 13 was sand-laden on the rails 11 to increase the adhesive strength and drive the electric vehicle.

The same phenomenon as the idling of the wheels 11 when the electric vehicle is running also occurs during braking by the brake operation. That is, when the braking force of the wheel 11 exceeds the adhesive force,
The transmission force of the wheel braking force to the rail 12 is reduced, and the wheel 11 appears as a so-called gliding phenomenon in which the wheel 11 slides on the rail 12. Even when this gliding was detected, the crew members were braking the electric vehicle by redepositing sand on the rails 11 to re-adhere.

Both the slipping phenomenon and the sliding phenomenon are caused by the wheel 11
Related to the adhesive performance between the wheel 12 and the rail 12, and is caused by a difference between the positive or negative tensile force of driving or braking the electric motor and the adhesive force between the wheel 11 and the rail 12. Is. Therefore, the only difference between the two is that the transmission of force from the wheel 11 to the rail 12 is a tensile force (positive) or a braking force (negative). The slipping phenomenon of No. 11 will be described below.

[0012]

As described above, the adhesive force between the wheel and the rail is greatly influenced by the environment of the rail, and the sand-dispersion operation itself by the crew member has a long-standing effect on the crew member. Since it was done relying on the experience and experience, it often wastes more sand than is necessary, often hindering the subsequent avoidance of slipping.

Further, particularly in the case of an electric vehicle, since the driving power is collected from the pantograph and the traveling rail is returned to the track, the electric resistance between the wheel and the rail becomes large when the sand on the rail increases. With increasing power loss,
The leakage current to the ground increased, which caused communication-induced interference, which was also a factor that caused position detection of electric vehicles and malfunction of various control devices on the ground.

Therefore, the present invention solves the above-mentioned conventional problems, and provides an idling control device for an electric vehicle capable of performing sand dispersion corresponding to the actual adhesive force at the site without depending on the intuition or experience of the crew. The purpose is to do.

[0015]

According to a first aspect of the present invention, there is provided an idling control device for an electric vehicle, comprising: a rotational speed detecting means for detecting a rotational speed of an electric vehicle drive motor; a rotational speed from the rotational speed detecting means; Introducing the vehicle body speed of the vehicle, the idling speed detecting means for detecting the idling speed of the wheel, the adhesive force calculating means for calculating the adhesive force between the wheel and the rail from the idling speed by the idling speed detecting means, Sand adhesion amount calculation means for comparing the adhesion force by the adhesion force calculation means and the tensile force of the drive motor based on the operation command of the electric vehicle, and calculating the sand dispersion amount corresponding to the difference, and the sand dispersion amount And a control means for controlling the sand blower so that the amount of sand calculated by the calculation means is scattered on the rail.

As described above, the invention according to claim 1 has the sand-dispersion amount calculation means, and the sand-dispersion amount corresponding to the adhesive force between the wheel and the rail, which is changing every moment, is calculated, and the control means is used. Since sand scattering is controlled, an appropriate amount of sand according to the site is sanded.

The idling control device for an electric vehicle according to claim 2 is
Rotational speed detecting means for detecting the rotational speed of the electric vehicle drive motor, acceleration detecting means for detecting the rotational acceleration of the wheel from the rotational speed by the rotational speed detecting means, wheel rotational acceleration from the acceleration detecting means, and cab An acceleration deviation detecting means for detecting the acceleration difference between the two by the command acceleration from, and a sand scattering amount calculating means for calculating a sand scattering amount capable of compensating the insufficient adhesive force corresponding to the acceleration difference by the acceleration deviation detecting means, And a control means for controlling the sand spreader so that the amount of sand calculated by the sand dispersion amount calculation means is scattered on the rail.

As described above, according to the second aspect of the invention, the acceleration deviation detecting means is provided, and it becomes possible to control the amount of sand dispersion corresponding to the difference between the acceleration command from the driver's cab and the wheel rotation acceleration by the crew. .

Accordingly, when the tensile force is insufficient at the time of the acceleration command and idling occurs due to an acceleration command, such as at the time of departure or running at an uphill grade, a deviation occurs between the vehicle speed and the wheel rotational acceleration. According to the method, appropriate sand dispersion is performed corresponding to the deviation.

According to a third aspect of the present invention, in the idling control device for an electric vehicle according to the first or second aspect, the drive motor is controlled by a signal corresponding to the sand dust amount calculated by the sand dust amount calculation means. It is characterized by doing.

As described above, according to the third aspect of the invention, not only the sand blower but also the drive motor is controlled by the signal corresponding to the amount of sand dust, so that the structure is simplified and at the same time the wheel is idle. Appropriate motor control is possible.

The invention according to claim 4 relates to claims 1 to 3.
In the idling control device for an electric vehicle according to any one of paragraphs 1, an addition unit that adds the amount of sand calculated by the amount calculation unit of sand, and the amount of sand added by the addition unit and an addition target And a display means for comparing the amount of the sand supplied to the sand blower while the sand is being sanded and displaying the difference.

As described above, in the invention according to claim 4, since the display means is provided and the amount of sand scattered and the amount of sand supplied to the sand spreader are compared and displayed, the crew member remains. Since the amount of sand to be used can be easily confirmed on the display, the sand dispenser can be managed appropriately.

According to a fifth aspect of the present invention, in the idling control device for an electric vehicle according to the fourth aspect, the sand spreader stores a plurality of types of sand having different conductivity or adhesiveness so that the sand can be selectively sanded. Calculating means for calculating the sand dispersion amount per unit travel distance from the sand dispersion amount added by the adding means and the traveling distance of the electric vehicle corresponding to the sand dispersion amount, and the unit traveling distance calculated by the calculating means It is characterized by comprising switching means for controlling the sand spreader so as to change the type of sand scattered on the rail when the amount of sand dispersion per hit exceeds a predetermined value.

As described above, according to the invention of claim 5, a plurality of types of sand are stored in the sand spreader so that the sand can be selectively sanded. Therefore, the amount of sand sand per unit traveled distance exceeds a predetermined value. In this case, it is possible to change to sand with higher conductivity or sand with higher conductivity by mixing and mixing, for example, to obtain re-adhesion and to run without decreasing conductivity between the wheel and rail. It can be continued smoothly.

According to a sixth aspect of the present invention, in the idling control device for an electric vehicle according to the fourth aspect, the sand spreader stores a plurality of types of sand having different conductivity or adhesiveness so that the sand can be selectively sanded. The control means controls the sand blower so as to change the ratio of the plurality of types of sand to be sanded in accordance with the sand dust amount calculated by the sand dust amount calculation means.

As described above, in the invention according to claim 6 as well, a plurality of types of sand are stored in the sand spreader, and the combination of the spread amount of each sand can be changed in accordance with the change in the sand spread amount. , For example, by changing the mixed combination of sand dust so that the total sand conductivity increases and the conductivity increases, the conductivity between the wheel and the rail is reduced as in the invention of claim 5. Without this, it is possible to continue the running smoothly.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.
It will be described in detail with reference to FIGS. It should be noted that the same components as those of the conventional configuration shown in FIG. 9 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a block diagram showing a first embodiment of an idling control device for an electric vehicle according to the present invention. That is, the drive motor 7 is mounted on a bogie frame or a vehicle body of an electric vehicle, and its propulsive force is transmitted via a gear device attached to the wheel shaft of the wheel 11. The drive motor 7 is provided with a speed sensor 9, and the electric motor rotation speed detected by the speed sensor 9 is supplied to the wheel speed detection circuit 14 and the wheel 11
Is converted into the rotation speed 11a of the above and is supplied to the first comparison circuit 15.

The first comparison circuit 15 is supplied with a rotation speed 11a of the wheel 11 and a vehicle speed 16a separately detected by a vehicle speed detector 16 such as a tachometer.
From the first comparison circuit 15, the rotation speed 11a of the wheel 11 is
And the vehicle speed 16a, that is, the idling speed 15a of the wheel 11 is derived and supplied to the adhesive force calculation circuit 17.

The adhesive force between the wheel 11 and the rail 12 is
As shown in Figure 2, sunny days (a) and rainy and snowy days (b)
And the like, and the characteristics of the idling speed 15a change accordingly.

Therefore, the adhesive force calculation circuit 17 of FIG. 1 selects and compares the adhesive force estimation curve (c) based on the situation such as the weather at the site, and the idle speed 15a from the first comparison circuit 15 is selected.
The adhesive force 17a corresponding to is found and is supplied to the second comparison circuit 18.

The second comparing circuit 18 is supplied with the adhesive force 17a from the adhesive force calculating circuit 17 and the torque command 8a from the driver's cab 8 based on the speed instruction by the crew member, and the difference (deviation value) output 18a between them is supplied. Drive motor 7
The torque throttling signal is supplied to the inverter 5 as a torque throttling signal in order to compensate for the difference and to achieve re-adhesion.

The sand scattering amount calculation circuit 19 also introduces the torque output 8a from the driver's cab 8 together with the differential output 18a from the second comparison circuit 18 to determine the sand scattering amount required to avoid idling. Calculate The sand dust amount signal 19a calculated by the sand dust amount calculation circuit 19 is supplied to the controller 20, which controls the sand duster 21 so that the calculated amount of sand is scattered on the rails 12 and at the same time the adder 22 Is supplied to.

FIG. 3 shows the relationship between the torque command 8a in the sand amount calculation circuit 19 and the sand amount. When idling occurs, first the torque command value (100% ) Is performed, and re-adhesion is achieved by controlling the inverter 6 by the torque throttle as described above.

However, the condition of the rail surface is bad due to a steep slope, rain, snow, etc., and the tensile force beyond the adhesive force cannot be secured only by increasing the torque reduction amount T. The sand amount calculation circuit 19 uses the torque command 8a from the cab 8 and the second
Since the sand amount (%) along the characteristic curve d based on the relative to the difference output 18a of the comparison circuit 18 is calculated and supplied to the controller 20, re-adhesion is performed by the sand from the sand blower 21. Be seen.

Incidentally, the sand blower 21 in this embodiment
As shown in FIG. 1, a plurality of types of sand 211, 212, and 213 having different sticking rates are stored in advance so that they can be sand-sanded, and they are arbitrarily stored by a control signal from the controller 20. A selector 214 is provided so as to be combined with each other, and each amount is arbitrarily set so that sand can be dispersed. That is, the controller 20 receives the sand dust amount signal 19a from the sand dust amount calculation circuit 19, and selects the sand 211, 212, and 213 composed of the re-adhesive combination so that the sand 211, 212, and 213 can be sand dusted.
Control 14.

On the other hand, the adder 22 also supplied with the sand-dispersion amount signal 19a adds the sand-dispersion amounts after the start of a series of sand-dispersion for each sand 211, 212, 213 and integrates them, and compares them. And supplies the sum to the calculator 23
Supply to 5.

The comparator 23 is provided for each sand 21 from the adder 22.
1,212,213 sand addition output, sand remaining amount of sand 211,212,213 at the start of a series of sand dust, and the amount of sand added after the start of sand dust By comparing the introduction with the sum of each sand 211, 212,
The present remaining amount of 213 is calculated, and the supply is displayed on the display 24 such as the driver's cab. Therefore, since the present remaining amount of each sand in the sand spreader 24 is displayed on the display device 24, the crew member can appropriately manage the amount of sand remaining in the sand spreader.

Although the display unit 24 displays the present remaining amount of the sand duster 24, the required minimum remaining amount is determined in advance,
The margin up to the minimum remaining amount may be calculated, and the supply alarm signal for the sand duster 21 may be lit up and displayed.

By the way, as described above, normally, when the amount of sand dispersion increases, the electrical connection between the wheel 11 and the rail 12 decreases. However, when a plurality of sands 211, 212, 213 having different conductivity or adhesiveness are stored in the sand duster 21, the selector 214 appropriately selects the sands 211, 212, 213 having different conductivity. It is possible to change the electric conductivity and the adhesiveness by any desired combination of these sands and secure necessary conduction, and at the same time, to realize the re-adhesion and avoid the idling.

That is, in this embodiment, as shown in FIG. 1, the traveling distance calculator 26 is supplied with the vehicle body traveling speed 16a from the vehicle body speed detector 16 and calculates the traveling distance after the start of sand dusting. , To the calculator 25.

Therefore, the calculator 25 calculates the sand dispersion amount per unit travel distance, for example, 1 m from the travel distance of the electric vehicle after the start of sand dispersion and the total sand dispersion from the adder 22, and the comparison switch 27 is calculated. Supply. A threshold setting unit 28 is connected to the comparison switching unit 27, and the amount of sand per unit traveled distance and the threshold setting unit 2 are connected.
8 is compared with the preset sand-dispersion amount k, and when the sand-dispersion amount per unit travel distance exceeds the reference sand-dispersion amount k, the sand discharged from the sand spreader 21 and spread on the rails 12 is, for example, Selector 214 is controlled to switch from less conductive sand to more conductive sand.

In this way, if the amount of sand is too large, the wheel 1
Although the electrical conduction between the rail 1 and the rail 12 is reduced, the selector 214 receives the control signal from the comparison switch 27,
Even if the amount of sand per unit travel distance increases and the conductivity decreases, the sand scattered on the rails 12 is switched to sand with better conductivity, and therefore sand is dispersed between the wheels 11 and the rails 12. It is possible to secure electrical continuity contact between them and avoid power loss and malfunction of the communication control circuit.

As described above, according to the first embodiment,
At the beginning of idling, re-adhesion is achieved by a torque throttling command in the VVVF inverter 6, but the rail surface is likely to slip due to rain, snow, or the like, or the adhesive force between the wheels and the rail may be increased due to an upslope or the like. When it becomes lower than the propulsive force due to, and it becomes impossible to accelerate, the sand spreader 13 is controlled so that the required amount of sand is executed according to the idling state of the wheel 11, so that appropriate sand is performed. It is possible to avoid wasteful consumption of sand.

Next, in the first embodiment, the idling control based on the adhesive force 17a from the adhesive force calculating circuit 17 in the second comparing circuit 18 has been described.
It is also possible to avoid the idling by calculating an appropriate amount of sand and controlling the sand blower based on the rotation acceleration of the.

FIG. 4 is based on the acceleration of the drive motor 7,
It is a block diagram which shows 2nd Embodiment of the idling control apparatus of the electric vehicle by this invention comprised so that a sandblaster may be controlled.

That is, similarly to the first embodiment, the motor rotation speed detected by the speed sensor 9 is supplied to the wheel speed detection circuit 14, and the rotation speed 11a of the wheel 11 connected to the motor shaft is calculated. Is supplied to the acceleration detection circuit 29.

In the acceleration detection circuit 29, the wheel acceleration 29a is calculated based on the wheel rotation speed 11a and is supplied to the comparison circuit 30.

On the other hand, the torque command 8a based on the speed designation from the cab 8 is supplied to the acceleration reference detection circuit 31, and the acceleration reference detection circuit 31 has a vehicle traveling condition 8b set in the cab 8. That is, the mass W of the vehicle, the gradient resistance Rg (V) of the rail 12, and the running resistance R
r is supplied.

Therefore, the acceleration reference detection circuit 31 calculates the reference acceleration command α based on the following equation (2) and supplies it to the comparison circuit 30.

Α = (F (V) -Rr (V) Rg (V)) / W Formula (2) where F (V): tensile force Rr (V) according to torque command 8a: starting resistance and curve resistance Running resistance Rg (V): gradient resistance W of the rail 12: mass of the vehicle Therefore, the comparison circuit 30 between the acceleration command α from the acceleration reference detection circuit 31 and the wheel acceleration 29a from the acceleration detection circuit 29. Deviation value 30a is calculated and supplied to the sand amount calculation circuit 19.

In the circuit shown in FIG. 4, the comparison circuit 30
Although the deviation value 30a from 30 is shown to be supplied only to the sand amount calculation circuit 19, like the first embodiment,
The deviation value 30a may also be supplied to the inverter 6 so that torque throttling is automatically performed prior to or in combination with sand scattering, or by a separate notch command in the cab 8 by a crew member, The torque may be throttled.

In any case, in this embodiment, sand control based on the deviation of acceleration is performed. Therefore, when the deviation value 30a remains after passing through the torque throttle T, as shown in FIG. 5, sand spreading is started with the sand starting point being the point P at which the adhesive force exceeds the tensile force. Since sand dispersion along the curve e corresponding to the increase in the acceleration deviation is executed, the idling of the wheel 11 is eliminated, and stable traveling corresponding to the acceleration command α is performed.

In addition, in the second embodiment, particularly when the wheel 11 is spinning at a low acceleration, sand having good conductivity is sprinkled to cause poor electrical contact between the wheel 11 and the rail 12. It is configured to avoid.

That is, from the acceleration 29a of the wheel 11 and the total amount of sand dust obtained by the adder 22, the amount of sand dust β due to the speed change can be obtained by the following equation (3).

Sand dispersion amount β due to speed change = (total sand dispersion / wheel acceleration 29a) (3) The sand distribution amount β due to this speed change is large at a certain time or a certain traveling distance,
Further, since the speed becomes large when the speed change is small, as shown in FIG. 6, when the sand dispersion amount due to the speed change exceeds a certain amount L, the ratio% of spreading the conductive sand on the rail 12 is increased. The comparison switch 28 controls the selector 214 of the sand blower 21.

As a result, when the idling is continued with the speed change being relatively small, the highly conductive sand is sprinkled,
Poor electrical contact between the wheel 11 and the rail 12 can be avoided.

As described above, in the second embodiment,
The sand spreader 21 is controlled by the sand-dispersion command based on the mass of the vehicle on the rail 12, the train resistance such as the gradient resistance and the traveling resistance, and the acceleration of the electric vehicle.
Appropriate sand is distributed according to the situation of the two sides.

In the above description, the torque throttling control for the drive motor 7 is performed by some method prior to sand dusting. However, if the torque throttling control is not performed before sand dusting, The deviation value 30a between the acceleration 29a and the acceleration command α is a value based on the condition of the train resistance such as the gradient resistance of the rail 12 and the running resistance.

Since the idling control devices for electric vehicles in the first and second embodiments are both configured to be able to control the sandblaster as well as the inverter, the idling control device can be used for electric vehicles. It can be mounted on a trolley to accommodate the drive wheels.

That is, FIGS. 7 and 8 are configuration diagrams showing a third embodiment of the idling control device for an electric vehicle according to the present invention, which is mounted on a bogie of the electric vehicle.

That is, a plurality of trucks 301 and 302 are attached to the lower portion of the electric vehicle body in the front-rear direction of the vehicle body, and a pair of trucks 301 and 302 are provided corresponding to the drive motors 71 and 72 attached to the trucks 301 and 302, respectively. Wheels 11a,
11b are rotatably attached. Corresponding to the pair of wheels 11a and 11b, as shown in FIG. 8, two sets of idle control devices A and B, which are combined with corresponding inverters 71 and 72, are installed and configured.

As described above, the control of the inverters 61 and 62 for controlling the driving electric motors 71 and 72 and the idling control device A,
Since B is attached to each of the trucks 301 and 302, the structure can be downsized, and at the same time, appropriate sand dispersion can be performed according to the idling state of each of the wheels 11a and 11b.

[0065]

According to the invention of claim 1, even when the condition of the rail surface is deteriorated and the adhesive force between the wheel and the rail becomes lower than the pulling force by the drive motor, it is automatically and appropriately selected. Adhesive strength can be increased by such sand scattering, and the electric vehicle can be operated smoothly without causing a stop due to poor acceleration on an uphill slope. In addition, the adhesive force is calculated according to the state of idling, and sand is sanded only when the adhesive force is lower than the tensile force, so the amount of sand consumed is kept to a minimum, and The burden can be reduced.

According to the second aspect of the invention, even if the condition of the rail surface is deteriorated and the adhesive force between the wheel and the rail is smaller than the tensile force, from the route data of the rail surface and the acceleration of the electric vehicle, Since the amount of sand dust is calculated, the amount of sand dust can be suppressed to the necessary minimum. Further, similarly to the invention according to claim 1, it is possible to avoid a stop due to poor acceleration or the like on an uphill slope, and to reduce the burden on the crew of managing the sand spreader. According to the invention of claim 3, by configuring the control of the induction motor and the control of the sand spreader by the same block, the sand spreader can be operated according to each idling state of each wheel. Therefore, it is possible to downsize the configuration of the control unit of each wheel, and it is possible to make the sand blower common to a plurality of driving vehicles.

According to the invention of claim 4, since the amount of sand in the sand spreader is displayed on the display, the maintenance and management of the sand spreader by a crew member can be facilitated.

According to the fifth aspect of the invention, even if the amount of sand is increased, sand with different conductivity is switched and sanded so that the conductivity between the wheel and the rail is not hindered. It is possible to prevent power loss due to poor electrical contact and malfunctions such as position detection and signal control of the electric vehicle.

According to the invention of claim 6, as in the invention of claim 5, the conductivity between the wheel and the rail is ensured even if the amount of sand dust increases due to the condition of the rail surface. In addition, since a plurality of sands having different conductivity are appropriately selected and combined, it is possible to prevent power loss, prevent position detection of the electric vehicle, and prevent malfunction of various control devices.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a relationship between idling speed and adhesive force in the apparatus shown in FIG.

FIG. 3 is a diagram showing a relationship between a torque command and a sand dispersion amount command in the device shown in FIG.

FIG. 4 is a configuration diagram showing a second embodiment of an idling control device for an electric vehicle according to the present invention.

5 is a diagram showing a relationship between an acceleration deviation and a sand dispersion amount command in the device shown in FIG.

6 is a diagram showing the relationship between the amount of sand scattering and the ratio of conductive sand due to speed changes in the device shown in FIG.

FIG. 7 is a configuration diagram of an electric vehicle to which the idling control device for the electric vehicle according to the present invention is applied.

8 is a configuration diagram of the device in FIG. 7. FIG.

FIG. 9 is a configuration diagram showing a typical main circuit configuration example of a conventional idling control device for an electric vehicle.

[Explanation of symbols]

5,51,52 Filter reactor 6, 61, 62 Inverter 7,71,72 Drive motor 8 cab 8a Torque command (operation command) 9, 91, 92 Speed sensor (rotational speed detection means) 11, 11a, 11b wheels 12 rails 13 sand duster 14 Vehicle speed detection circuit 15 First comparison circuit (idle speed detecting means) 16 Vehicle speed detector 17 Adhesive strength calculation circuit (Adhesive strength calculation means) 18 Second Comparison Circuit 19 Sand amount calculation circuit 20 controller (control means) 21 sand blower 214 Selector 22 Adder (adding means) 23 Comparator 24 display 25 Calculator (calculating means) 26 mileage calculator 27 Threshold setter 28 Comparison switch (control means) 29 Acceleration detection circuit 30 comparison circuit 31 Acceleration reference detection circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B61C 15/10 B60L 9/18

Claims (6)

(57) [Claims] 1. A rotation speed detection means for detecting a rotation speed of an electric vehicle drive motor, and a rotation speed detection means for detecting a rotation speed of a wheel by introducing a rotation speed from the rotation speed detection means and a vehicle body speed of the electric vehicle. Based on the speed detecting means, the adhesive force calculating means for calculating the adhesive force between the wheel and the rail from the idle speed by the idle speed detecting means, and the adhesive force by the adhesive force calculating means and the operation command of the electric vehicle. The sand pulling amount calculating means for comparing the pulling force of the drive motor and calculating the sand throwing amount corresponding to the difference, and the amount of sand calculated by the sand throwing amount calculating means are scattered on the rails. An idling control device for an electric vehicle, comprising: a control means for controlling a sand container. 2. A rotation speed detecting means for detecting a rotation speed of an electric vehicle drive motor, an acceleration detecting means for detecting a rotation acceleration of a wheel from the rotation speed by the rotation speed detecting means, and a wheel rotation from the acceleration detecting means. Acceleration deviation detecting means for detecting the acceleration difference between the two based on the acceleration and the commanded acceleration from the driver's cab, and a sand dispersion amount capable of compensating for the insufficient adhesive force corresponding to the acceleration difference from the acceleration deviation detecting means. An idling control device for an electric vehicle, comprising: a sand amount calculating means; and a control means for controlling a sand spreader so that the amount of sand calculated by the sand amount calculating means is scattered on a rail. 3. The idling control device for an electric vehicle according to claim 1, wherein the drive motor is controlled by a signal corresponding to the sand dust amount calculated by the sand dust amount calculation means. . 4. Addition means for adding the sand-dispersion amount calculated by the sand-dispersion amount calculating means, and the sand-dispersion amount while the sand-dispersion amount added by the addition means and the sand to be added are sand-dispersed. 4. An idling control device for an electric vehicle according to claim 1, further comprising a display means for comparing the amount of sand supplied to the container and displaying the difference. . 5. The sand spreader stores a plurality of types of sand having different conductivity or adhesiveness so that the sand can be selectively sanded, and corresponds to the sand spread amount added by the adding means and the sand spread amount. Calculating means for calculating the amount of sand per unit traveled distance from the traveled distance of the electric vehicle, and when the amount of sand per unit traveled distance calculated by the calculating means exceeds a predetermined value, the rail 5. The idling control device for an electric vehicle according to claim 4, further comprising a switching unit that controls the sand blower so as to change the type of sand to be scattered. 6. The sand spreader stores a plurality of types of sand having different conductivity or adhesiveness so that the sand can be selectively sanded, and the control means calculates the sand spread calculated by the sand quantity calculating means. 5. The idling control device for an electric vehicle according to claim 4, wherein the sand blower is controlled so as to change the ratio of the plurality of types of sand to be sanded according to the amount.