JP2682054B2 - Electric car display - Google Patents

Description

The present invention relates to a display device for an electric vehicle.

[Prior Art] Generally, in an electric vehicle such as a battery forklift, when an abnormality occurs in an electric system, the abnormality is detected by an analyzer function incorporated in a traveling / cargo handling controller. That is, each electric part of the vehicle is connected to the controller, and when a malfunction or failure occurs in the vehicle, the controller checks the voltage of each electric part of the vehicle in a predetermined order. Then, when the voltage of each part is different from the reference voltage stored in the controller, the controller determines the abnormal part and displays the corresponding abnormal part in a predetermined manner using the battery capacity meter.

[Problems to be Solved by the Invention] The above-described analyzer determines the presence or absence of an abnormality based on the difference between the voltage of the corresponding portion and the reference voltage, and does not specifically display the voltage of the corresponding portion, but analyzes the abnormality. Then, in order to know the voltage of the corresponding part for quick repair, a separately prepared tester must be connected to each corresponding part.

However, the above tester is provided separately from the vehicle, and it is expensive to purchase, and it is not possible to measure the voltage of this part after connecting it to the connector of the relevant part of the vehicle. It is complicated.

The present invention has been made to solve the above-mentioned problems, and the object thereof is to have a tester function built into a vehicle, which is excellent in economic efficiency, and has a diagnostic function that enables easy voltage measurement of an abnormal portion. The purpose of the present invention is to provide an electric vehicle that is equipped with and is capable of quick maintenance.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention calculates the measurement result regarding the traveling and cargo handling of the vehicle by the first display control means, and displays the measured value on the display unit. In a display device of an electric vehicle for displaying, voltage detection means for detecting a voltage of each electric portion of a traveling system and a cargo handling system driven by electric power from a battery, and operation instruction means for instructing display of each electric portion,
A second display control means for selecting a corresponding voltage detecting means based on the operation of the operation instructing means and displaying the voltage detected by the selected voltage detecting means on the display section is incorporated in the vehicle. The summary will be given.

[Operation] By adopting the above-mentioned means, the present invention selects the voltage detecting means by the operation of the operation instructing means, and the display control means changes the voltage detected by the selected voltage detecting means into various measurement results. Instead, it is displayed on the display unit.

[Embodiment] A first embodiment in which the present invention is embodied in a tester device for a battery forklift will be described in detail below with reference to FIGS.

In FIG. 4, a lift lever 3, a tilt lever 4, and an accelerator lever 5 that also serves as a forward / backward movement selection are arranged in front of a steering wheel 1 of a forklift. Further, an instrument panel 8 shown in FIG. 2 is provided on the upper surface of the accommodating case 7 that accommodates the battery B and the like, and in the instrument panel 8, a digital indicator 9 as a display unit, a key switch 10, a selection switch. 11 are arranged respectively. In addition, the digital display 9 displays the remaining capacity of the battery by performing a 10-step lighting display, a 8-level level meter 13 showing a power reference value in each work, a traveling speed meter 14, and an hour meter. 15 are provided respectively.

Then, after the key switch 10 is turned on (turned on), the forklift is moved forward and backward by the forward and reverse rotations of the traveling motor 6 to be described later according to the operation direction and operation amount of the accelerator lever 5, and follows the operation amount of the accelerator lever 4. Drive at speed.

An electrical configuration of this embodiment will be described with reference to FIG. 1. A controller as first and second display control means.
Reference numeral 18 denotes a vehicle speed sensor including a selection switch 11 and a rotary encoder for detecting the rotational speed of the differential gear.
A key switch sensor 19 for detecting ON / OFF of the key switch 17 and the key switch 10 is connected, and a digital display 9 is also connected. When the key switch 10 is in the ON state and the selection switch 11 is not operated, the controller 18 keeps the indicator 9 in the normal display mode, and the hour meter 15 keeps the key switch 10 in the ON state. The time and the traveling speed of the vehicle at each time detected by the vehicle speed sensor 17 are digitally displayed on the speed meter 14.

In the traveling circuit 20, when the limit switch 16 is turned on by operating the accelerator lever 5, the contactor relay 16a is excited and the traveling motor 6 is rotated. Also, the operation angle of the accelerator lever 5 is detected by the potentiometer,
The transistor Tr is driven according to the detection result, and the chopper control of the motor 6 is performed. Then, the voltages of the electric parts of the traveling circuit 20 are detected, and the detection results are input to the controller 18.

That is, the point A for detecting the voltage of the key switch 10 in the ON state, the point B for detecting the voltage of the limit switch 16 closed based on the forward / backward tilting operation of the forward / backward lever 2, and the transistor B. Points C and D for detecting the collector voltage and emitter voltage of Tr are A /
It is connected to the controller 18 via the D converters 21 to 24, and the voltage values are converted into digital signals by the A / D converters 21 to 24 and output to the controller 18. In the cargo handling circuit, in order to detect the voltages of the solenoid valve driven by the operation of the lift lever 3, the tilt lever 4, etc., the cargo handling motor, etc., the points for detecting these voltages are appropriately connected to the controller 18. Has been done.

When the selection switch 11 is pressed, the controller 18 converts the digital display 9 from the normal display mode to the voltage display mode according to a program stored in advance, and the hour meter 15 of the digital display 9 is checked for voltage. Is displayed as a number in a predetermined manner, and the voltage of the corresponding electric part is displayed on the speedometer 14.

It should be noted that the selection of the electrical part for which the voltage check is performed is determined by the number of pressing operations of the selection switch 11, and one operation, that is, mode switching, causes the hour meter 15 to display " 00 ”is displayed and the voltage of the key switch 10 at the point A is, for example, 25 on the speedometer 14.
“25” indicating that it is V is displayed. After that, each time the selection switch 11 is operated one more time, the number displayed on the hour meter 15 is also increased by one, and the voltage detection points are changed to point B, point C, and point D. Is displayed on the speedometer 14.

Therefore, for example, when the traveling speed of the vehicle lags behind the speed instructed by the accelerator lever 5, the operator may find that the abnormality is due to the voltage values at the points B, C and D sequentially displayed on the speedometer 14 and the limit switch 16, the motor 6 and It is possible to confirm which one of the transistors Tr is in, and it is also possible to analyze the abnormality by knowing the voltage value of the electric part.

Then, when the number of operations of the selection switch 11 exceeds a predetermined number of times (that is, the number of parts where the voltage can be checked), the controller 18 returns the indicator 9 to the normal display mode,
The hour meter 15 and the speed meter 14 also perform the original display.

In this embodiment, the mode of the indicator 9 is switched through the controller 18 by operating the selection switch 11, and the hour meter 15 and the speed meter 14 are used to code and display the electric parts, and the electric By displaying the voltage of the part, it becomes possible to provide the same voltage measuring function as that of the tester, which has been conventionally different from the specification of the vehicle, in the vehicle.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, each connection point A, B, C, D is connected to a multiplexer 25, and the multiplexer 25 is connected to one A / D converter 26. Then, by operating the selection switch 11, the indicator 9 is switched from the normal display mode to the voltage display mode, and at the same time, the voltage from the connection point A is selected and sent to the A / D converter 26 and converted into a digital signal. Is input to the controller 18, and a numerical display corresponding to the voltage value is displayed on the speedometer 14. Then, the voltage at the different connection points B, C, D is displayed on the speedometer 14 by the subsequent operation of the selection switch 11.

In the above configuration, since the multiplexer 25 is used, the required number of A / D converters 26 can be reduced to one, and the cost can be reduced.

Note that the present invention is not limited to the above-described embodiment, and for example, it is possible to use a meter other than the speedometer 14 to display a voltage, or to use as a traveling display as a first display control means. Controller and a controller used for voltage display as the second display control means are separately provided, and these are switched by the operation of the selection switch 11 or applied to an electric vehicle other than a forklift, It is of course possible to make arbitrary changes such as using the self-diagnosis system of 1) without departing from the spirit of the present invention.

[Effect] As described in detail above, according to the present invention, by incorporating the tester function in the vehicle, it is possible to achieve excellent economical efficiency, and to easily perform voltage measurement of an abnormal portion and enable quick maintenance. Shows excellent effects.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention, FIG. 2 is a plan view showing a display meter in a normal display mode, and FIG. 3 is a partially cutaway plan view showing a display meter in a voltage display mode. 4 and 5 are side views showing a battery forklift having a tester function, and FIG. 5 is a circuit diagram showing a second embodiment. A digital indicator 9 as a display unit, a controller 18 as first and second display control means, points A, B, C, D as voltage detection means, and a battery B.

Front page continued (72) Inventor Kenji Suga 2-chome, Toyota-cho, Kariya city, Aichi Prefecture Toyota Industries Corporation (56) References JP-A-58-26649 (JP, A) JP-A-64-59080 (JP, A) JP-B 63-13135 (JP, B2)

Claims (1)

(57) [Claims] 1. A display device for an electric vehicle, in which a first display control means calculates a measurement result relating to traveling and cargo handling of a vehicle, and the measured value is displayed on a display unit, which is driven by electric power from a battery. Voltage detection means for detecting the voltage of each electric part of the traveling system and the cargo handling system, operation instructing means for instructing the display of each electric part, and selecting the corresponding voltage detecting means based on the operation of the operation instructing means, A display device for an electric vehicle in which a second display control means for displaying the voltage detected by the selected voltage detection means on the display section is incorporated in the vehicle.