JPH087762Y2 - Speed setting device for electric vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a speed setting device for accurately setting a speed such as a maximum speed position or a neutral position in an electric vehicle such as an electric wheelchair.

(Prior Art) In this type of electric vehicle, the variable resistance is changed and adjusted by the movement of the accelerator lever, which is a speed setting device, and its output voltage is taken out as a speed command signal, and the motor is energized based on the speed command signal. The speed is controlled by controlling the amount.

(Problems to be solved by the invention) In the traveling speed adjusting method of the above type, for example, in an electric wheelchair in which the maximum speed is determined,
It is necessary to regulate the movement of the accelerator lever within a predetermined range, and at the time of assembling or adjusting the product, operate the accelerator lever while measuring the output voltage of the variable resistance with a tester etc., and set it to the output voltage position corresponding to the maximum speed. The accelerator lever rotation range was set.

Therefore, a complicated man-hour such as measurement by a tester is required. The present invention seeks to eliminate such drawbacks.

(Means for solving the problem) (a). Motor drive control means for changing and adjusting the output voltage from the variable resistor 15 by operating the accelerator lever 12, and controlling the amount of electricity supplied to the motor 3 using the output voltage as a speed command signal; A neutral position setting means for adjusting the connection position between the accelerator lever 12 and the variable resistor 15 to set the neutral position of the accelerator lever 12; Or, and (d). Maximum speed setting means for setting the maximum speed by adjusting the rotatable range of the accelerator lever 12, and (e). A battery residual quantity display means for detecting the battery voltage and displaying the detected voltage by lighting a plurality of display devices 33, 33; Setting to switch to battery voltage output to the display device 33, 33 by operating the selector switch 35 when setting the neutral position or setting the maximum speed, outputting the comparison result of the speed command signal and the reference value, and lighting and displaying. (G) A speed setting device in an electric vehicle having a speed display means.

(Effect of the Invention) In this electric vehicle, the variable resistor 15 is changed and adjusted by operating the accelerator lever 12, the output voltage from the variable resistor 15 is taken out as a speed command signal, and the motor 3 is energized based on the speed command signal. Control the amount and drive.

When setting the maximum speed or neutral position of the electric vehicle at the time of product assembly or adjustment etc., if the accelerator lever 12 is operated after switching the changeover switch 35, the speed command signal from the variable resistor 15 is input to the CPU The display device 33, 33 that compares the voltage with the voltage
Output to. That is, when the speed command signal matches the reference value, the specific display device 33 among the plurality of display devices 33, 33 is turned on. Therefore, the maximum speed can be easily set by adjusting the stopper that restricts the rotation range of the accelerator lever 12 to this position, and when the neutral position is set, the maximum speed between the accelerator lever 12 and the variable resistor 15 is set. The connection position is adjusted while watching the display device 33.

(Effect of the Invention) Since the present invention is configured as described above, when setting the maximum speed and the neutral position of the electric vehicle, the variable resistance that is the speed command signal is operated by operating the changeover switch 35.
The output voltage from 15 is compared with the reference value, and the comparison result is notified by turning on the display device 33 that displays the remaining battery capacity. While checking the lighting of the display device 33, the maximum speed and the neutral position can be easily operated. Can be set accurately with.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the embodiment, the speed control device of the present invention is applied to an electric wheelchair, and the electric wheelchair is driven by one front wheel 2 steerable by a steering wheel 1 and a motor 3 via a car box (not shown). It comprises a pair of possible rear wheels 5, 5, a vehicle body frame 6, a battery storage case 7, a rear cover 8, a seat 9 and the like.

Reference numeral 10 denotes an operation box, which is configured to be vertically separable, and in which a concave mounting base 11 is attached, and an operation shaft 13 is rotatably supported between the left and right compatible walls. is there. Further, an accelerator lever 12 is attached to the extension of the operation shaft 13 to the outside of the operation box 10, and the rotation of the operation shaft 13 can be transmitted to a variable resistor 15 via transmission gears 14, 14. Configured. The transmission gears 14, 14 are attached to their respective shafts by set screws 16, 16.

Further, a neutral position returning device 17 is provided on the operating shaft 13 so that the accelerator lever 12 returns to the neutral position when the accelerator lever 12 is released.

Reference numeral 18 denotes an advance side stopper, which is screwed to a mounting plate 19 attached to the mounting base 11 so as to be able to move forward and backward, and a rotation range of the cam body 20 attached to the operation shaft 13 in the forward operation direction (a). Regulate. Similarly, reference numeral 21 denotes a reverse-travel side stopper, which regulates the range of rotation of the operating shaft 13 in the reverse direction (b).

Further, 22 is a speed change switch for inputting high speed, medium speed and low speed command signals to the CPU 23 of the control device.

A horn switch 24 inputs a command signal to the CPU 23 and then outputs it to the horn 25. Reference numeral 26 is a power switch for starting the CPU 23.

The variable resistor 15 has an operating shaft 13 at a substantially middle position of its adjusting range.
The transmission gears 14 and 14 are connected to each other so as to correspond to the neutral position, and the output voltage thereof is input to the CPU 23 as a speed command signal via the A / D converter.

36 is a temperature sensor, which detects the temperature near the drive transistor of the control unit and inputs it to the CPU 23 via the A / D converter,
When the temperature rises, the motor drive current is limited to protect the motor 3 and the controller.

The motor 3 is connected to a power source via a forward / reverse switching relay 27, and the forward / backward switching relay 27 is configured so that the output from the variable resistor 15 can be judged by the CPU 23 and switched.

28 is a motor drive transistor, which responds to the speed command signal from the variable resistor 15 via the CPU 23 to drive the motor drive circuit 2
It is configured to be able to energize 9.

A current detector 30 is provided in the motor drive circuit 29 to detect the motor drive current, which is input to the CPU 23 via an A / D converter, and the load state is detected to control the duty ratio (duty ratio), etc. To use.

Reference numeral 31 is a rotation speed detection device, and specifically, measures the electromotive force generated by inertial rotation of the motor 3 when the drive pulse to the motor 3 is off, and inputs it to the CPU 23 via the A / D converter to determine the actual traveling speed. To detect.

Reference numeral 32 is a negatively-actuated electromagnetic brake that releases braking by energizing while running and returns by spring force while stopping to apply braking force to the motor shaft.

The battery remaining amount display devices 33, 33 are composed of five LEDs, and the output from the battery voltage detection device 34 is processed by the CPU 23 to light up the number of LEDs according to the remaining amount.

The changeover switch 35 is a speed change switch 22 and a horn switch 24.
1 and a power switch 26. As shown in the flowchart of FIG. 1, when the speed change switch 22 is set to medium speed and the power switch 26 is turned on with the horn switch 24 pressed, the set speed is displayed only when the CPU 23 starts up. It is switched to the mode. At the time of normal starting, that is, when the changeover switch 35 is not operated, the circuit is switched to the traveling mode and the circuit is circulated.
Display the battery level. To return from the set speed display mode to the traveling mode, the power switch 26 is once turned off and reset, and then a normal start operation may be performed.

In the set speed display mode, the speed command signal from the variable resistor 15 is compared with the reference value in the CPU 23, and the comparison result is output to the display devices 33, 33.

More specifically, as shown in FIG. 2, the output setting range of the variable resistor 15 is ± (constant range) from the intermediate position to neutral (N), and + side constant range from this end to the forward speed adjusting range (F). Further, the + side constant range is set to the maximum forward speed maintaining range (FM), the − side constant range is set to the reverse speed adjustment range (R) from the other end of the neutral range, and the − side constant range is set to the reverse maximum speed. It is set to the maintenance range (RM).

In the set speed display mode, when the speed command signal from the variable resistor 15 is in the neutral range (N),
The output is compared and calculated in the CPU23 with the reference value, and 5 LEDs are connected.
Of the display devices 33, 33, it is output to the central LED display device 33 for lighting display, and when it is within the maximum forward speed maintaining range (FM), similarly to the LED display device 33 on the right end, further reverse maximum speed maintaining If it is within the range (RM), it is output to the leftmost LED display device 33 and is turned on.

Therefore, when assembling or adjusting the operating part, when switching to this set speed display mode, first, the accelerator lever 12
It is possible to see at a glance whether or not is in the neutral state by the display device 33, 33. If it is outside the neutral range (N), loosen the set screws 16, 16 to disengage the transmission gear 14,
The output of the variable resistor 15 is adjusted by changing the meshing state of 14.

Next, the accelerator lever 12 is operated in the forward direction (a) or the reverse direction (b) by the maximum angle, and the LED display device 3 in that state is operated.
By visually observing 3,33, it is possible to know whether the maximum speed is maintained within the respective maximum speed maintenance range. If it is outside that range, the forward stopper 18 or reverse stopper
Rotate 21 to move back and forth with respect to mounting plates 19, 19 Accelerator lever 1
Adjust the operation angle range of 2.

If the output from the variable resistor 15 outside the set range is also displayed on the LED display devices 33, 33, the output change of the variable resistor 15 can be easily understood.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a flow chart, FIG. 2 is a view showing an output setting range of a variable resistor 15, and FIG. 3 is a display state of a display device 33. Figure,
FIG. 4 is an overall perspective view of the electric vehicle, FIG. 5 is an exploded perspective view of the operating portion, and FIG. 6 is a control block diagram. In the figure, reference numeral 12 is an accelerator lever, 15 is a variable resistance, 3 is a motor, 33 is a display device, 35 is a changeover switch, N is a neutral range, F is a forward speed adjusting range, F and M are maximum forward speed maintaining ranges, R indicates the reverse speed adjustment range, and R and M indicate the reverse maximum speed maintaining range.

Claims (1)

[Scope of utility model registration request] 1. A. Motor drive control means for changing and adjusting the output voltage from the variable resistor 15 by operating the accelerator lever 12, and controlling the amount of electricity supplied to the motor 3 using the output voltage as a speed command signal; A neutral position setting means for adjusting the connection position between the accelerator lever 12 and the variable resistor 15 to set the neutral position of the accelerator lever 12; Or, and (d). Maximum speed setting means for setting the maximum speed by adjusting the rotatable range of the accelerator lever 12, and (e). A battery residual quantity display means for detecting the battery voltage and displaying the detected voltage by lighting a plurality of display devices 33, 33; When the neutral position is set or the maximum speed is set, the battery voltage output to the display device 33, 33 is switched by operating the selector switch 35, and the comparison result between the speed command signal and the reference value is output to light and display. Speed display means is provided, and (g). Speed setting device for electric vehicles.