JPH01278207A - Controlling method for electric railcar - Google Patents

Abstract

PURPOSE:To eliminate a push-pull phenomemon which occurs between wheels having different diameters of an electric railcar by calculating a wheel diameter correction coefficient on the basis of the wearing amount of the tread faces of wheels, and multiplying it by the output of a current limiting value pattern generator. CONSTITUTION:A distance l between a wheel 10 to be measured and a strain gauge 9 secured to a bearing box an axle having an always constant relative position to the axial center of the wheel 10 is measured, and is output to a wheel diameter corrector 8. The corrector 8 calculates a real wheel diameter WD at that time, and outputs a wheel diameter correction coefficient. Further, the output of a current limiting value pattern generator 4 is multiplied by that of the corrector 8, and input to a comparator 5. The comparator 5 compares the input value with the value of the rear armature current of the output of a real armature current measuring circuit 7, and outputs a cam axis stage advancing command to a cam motor rotation instructing circuit 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in the control system of a controller essential for the safety and punctual operation of electric vehicles, particularly electric vehicles for railway vehicles.

[Conventional technology]

The most common electric vehicle control method is a resistance-controlled gum shaft advance control method using a DC motor.

Figure 2 shows the functions of the controller that employs the camshaft advance control method, where 1 is a forward command circuit, 2 is a brake command circuit, and 3 is a brake command circuit.
4 is a variable load signal circuit, 4 is a current limit value pattern generation circuit, 5 is a comparator, 6 is a cam motor rotation command circuit, and 7 is an actual armature current measuring circuit.

In FIG. 2, a current limit value pattern generation circuit 4 calculates a necessary current limit value based on the output of the drive command circuit 1 or the brake command circuit 2, and uses this value and the electric motor (not shown) that drives the wheels of the electric vehicle. The comparator 5 compares the value of the actual armature current measuring circuit 7 of
The motor is controlled by outputting a command to advance the camshaft (not shown) to the motor.

The variable load signal circuit 3 outputs a command to increase or decrease the value of the current limit value pattern generation circuit 4 within a certain range in response to an increase or decrease in the load on the electric vehicle. Therefore, a function is achieved in which the acceleration/deceleration of the electric vehicle is constant regardless of the load carried by the electric vehicle.

[Problem that the invention seeks to solve]

Thus, in the conventional electric vehicle control method, if the wheel diameter is always constant, the function of the variable load signal circuit is only performed, and the acceleration/deceleration of the electric vehicle can be kept constant regardless of the load. It is possible to run on time with a certain run curve.

However, the wheel diameter changes due to wear during use, so if the wheel diameter changes, and the torque of the electric motor is constant, the tensile force generated at the outer circumference of the wheel will change. As becomes smaller, the tensile force on the outer circumference of the wheel increases, and the apparent upper deceleration increases. As a result of this phenomenon, the traveling time of electric cars in a certain section changes, and in electric cars that are equipped with multiple controllers, push-pull phenomena occur.

[Means for solving problems]

The present invention has been made to solve the above-mentioned problems, and is equipped with a controller that obtains a control output signal of an electric motor that drives the wheels of an electric vehicle. In addition to measuring the amount of wear, the output of this displacement meter was input to the wheel diameter correction circuit to calculate the wheel diameter correction coefficient value, and the output of the current limit value pattern generation circuit was multiplied to correct the wheel diameter. By outputting the current limit value to the comparator, a camshaft advancement command is given to the cam motor rotation command circuit via the comparator.

[For production]

However, in the present invention, if a displacement meter is installed in a part of the truck so as to face the wheel tread, the distance between the displacement meter and the wheel tread can be measured, and the output of the displacement meter is input to the wheel diameter correction circuit. A wheel diameter correction coefficient is calculated, and the wheel diameter of the current limit value can be automatically corrected by multiplying the wheel correction coefficient and the output of the current limit value pattern generation circuit.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the electric vehicle control method to which the present invention is applied, in which the same reference numerals as in FIG. 2 indicate parts having the same functions, 8 is a wheel diameter correction circuit, 9 is a displacement meter,
10 indicates a wheel. Here, the displacement meter 9 is a device that measures the distance between the object to be measured and the object to be measured in a non-contact manner. By detecting the object, the distance between the objects to be measured is measured. It is clear that the amount of wear on the wheel tread can be measured by fixing the displacement meter 9 to the bearing box of the axle of the wheel 10 so as to face the tread of the wheel 10.

In other words, the distance 1 between the wheel 10 and the displacement meter 9 whose bearing assembly number ζ of the axle whose relative position with respect to the axle center of the axle 10 to be measured is always constant is fixed is measured, and the displacement meter 9 is used to correct the wheel diameter. Send an electrical signal to circuit 8. Here, the wheel diameter correction circuit 8 accurately calculates the actual wheel diameter WD at that time, and outputs the ratio with the vehicle diameter set when determining the electric car vehicle performance as a wheel diameter correction coefficient.

Further, the output of the current limit value pattern generation circuit 4 and the output of the wheel diameter correction circuit 8 are multiplied and input to the comparator 5. The comparator 5 compares this input value with the value of the actual armature current output from the actual armature current measuring circuit 7.

Therefore, if necessary, the comparator issues a command to advance the camshaft to the cam motor rotation command circuit 6, thereby controlling the axle drive motor of the electric vehicle.

In this embodiment, the wheel diameter WD is measured by fixing one displacement meter to the bearing box of the axle whose relative position to the axle center of the wheel to be measured is always constant. Even if a method is used in which a plurality of displacement meters are installed facing the tread of the wheel to be measured from multiple directions, and the distance 1 between the wheels and the tread is processed mathematically to calculate the wheel diameter WD. good. A similar effect can be obtained even if a displacement meter is installed at a portion of the bogie whose relative position with the wheels changes during travel.

〔Effect of the invention〕

As explained above, according to the present invention, a wheel diameter correction circuit is provided which is equipped with a displacement meter for detecting the wheel diameter, and a variable load signal circuit is also used. It is possible to realize electric vehicle control that maintains constant acceleration/deceleration regardless of changes, and it also eliminates phenomena such as push-pull that occurs between electric vehicles with different wheel diameters and unbalanced loads on wheel drive motors.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment to which the present invention is applied, and FIG. 2 is a block diagram showing the functions of a controller that uses a resistance-controlled camshaft advancement method using a general DC motor. . 1... Power running command circuit, 2... Brake command circuit, 3... Load variable signal circuit, 4...
- Current limit value pattern generation circuit, 5.--Comparator, 6
...--Cam motor rotation command circuit, 7...-
Actual armature current measurement circuit, 8...Wheel diameter correction circuit.

Claims (1)

[Claims] In an electric vehicle control method including a controller that obtains a control output signal of an electric motor that drives wheels of an electric vehicle, a change in wheel diameter is measured by a displacement meter, and a displacement signal of the change is input to the controller. An electric vehicle control method characterized in that a control output of the electric motor is obtained by performing arithmetic processing on the electric vehicle.