JPH0779504A - Small electric car - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a small electric vehicle capable of displaying a mileage based on the amount of electric power actually charged when the battery is charged. [Structure] A battery 7 and a charger 9 are mounted, and a discharge power amount detecting means 11 for integrating and detecting a discharge power amount from the battery 7 is provided, and based on a detection result of the discharge power amount detecting means 11. A small electric vehicle provided with a display means 10 for displaying the integrated value of the discharge electric power,
The discharge power amount detection means 11 resets the discharge power amount on the display means 10 to a predetermined value by the charge start signal from the charger 9, and adds the charge power amount to the reset predetermined value to determine the dischargeable power. The remaining dischargeable electric energy is displayed as a value on the displaying means 10 and the discharging electric energy from the battery 7 is subtracted from the displayed charging electric energy.
A display control means 13 for displaying 0 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electric vehicle equipped with a rechargeable battery.

[0002]

2. Description of the Related Art Conventionally, in this kind of small electric vehicle,
The voltage value between terminals of the mounted battery is detected, and the dischargeable electric energy in the mounted battery is notified based on the voltage value between the terminals.

[0003]

By the way, since the chargeable capacity of a battery decreases as it is used for a long period of time, the travelable distance per charge of the battery also becomes shorter as the battery ages. But
In the above-mentioned conventional device, there is no means for notifying the remaining travelable distance even if it is desired to know the remaining travelable distance at each charging or during use. For this reason, even if the battery is old, the operator may mistakenly judge that the battery can travel a predetermined distance when charging, just like a new battery. Then, there was a possibility that the power supply capacity of the battery would drop on the way and the vehicle would be unable to run. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a small electric vehicle capable of displaying a travelable distance based on the amount of electric power actually charged when a battery is charged.

[0004]

In order to achieve the above object, a small electric vehicle according to the present invention is equipped with a battery and a charger, and discharges by integrating and detecting the amount of electric power discharged from the battery. In a small electric vehicle equipped with a power amount detecting means and a display means for displaying the value of the discharge power amount integrated based on the detection result of the discharge power amount detecting means, the discharge power amount detecting means is the charging The discharge power amount in the display means is reset to a predetermined value by the charge start signal from the device, and the value obtained by adding the charge power amount to the reset predetermined value is displayed on the display means as the value of the dischargeable power amount, And a display control means for displaying the remaining dischargeable electric energy on the display means in a state of subtracting the discharged electric energy from the battery from the displayed charging electric energy value. To. Operation by this characteristic configuration
The effects are as follows.

[0005]

That is, the battery and the charger are mounted, and the discharge power amount detecting means for integrating and detecting the discharge power amount from the battery is provided, and the discharge power amount detecting means is integrated based on the detection result. In a small electric vehicle provided with a display means for displaying the value of the discharge power amount, the discharge power amount detecting means resets the discharge power amount on the display means to a predetermined value by a charging start signal from the charger, and resets the value. A value obtained by adding the charge power amount to a predetermined value is displayed on the display means as a value of the dischargeable power amount, and the remaining dischargeable power amount is subtracted from the displayed charge power amount value by the discharge power amount from the battery. Since the display control means for displaying on the display means is provided, the value charged by the display means based on the charging power amount from the state of being reset to a predetermined value is set as the dischargeable power amount each time the battery is charged. It supposed to be displayed Te, by displaying the dischargeable power amount as a travelable distance, so that the remaining traveling distance or the like operator can determine by looking at the display means.

[0006]

Therefore, since the remaining travelable distance is displayed on the display means, the operator can determine the remaining travelable distance according to the charge amount from the display on the display means before traveling. As a result, it has become possible to solve the problem that the rotational driving of the electric motor is stopped by mistake due to the reduction of the electromotive force of the battery during traveling.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an example of a small electric vehicle according to the present invention. In this small electric vehicle, the rear portion of the body frame 5 supported by a front wheel 2 steered by a steering wheel 1 and a pair of left and right rear wheels 4, 4 driven by an electric motor 3 is operated by a manipulator. A seat 6, a pair of left and right batteries 7, 7 and a control device 8 are mounted and configured.

As shown in FIG. 1, a charger 9 for charging the batteries 7 and 7 is provided, and the amount of charge is detected during charging by the charger 9, and based on the detection result. A display device 10 is provided as a display unit capable of displaying the amount of charging power and thus the travelable distance. The display device 10 is provided on a panel portion of the steering wheel 1. The display device 10 includes a display unit that displays the charge amount in an analog manner such as a bar graph type as described later. The electric motor 3 and the driving circuit for the headlight are provided with discharge power amount detecting means 11 for detecting the amount of power supplied from the batteries 7, 7 to the electric motor 3 and the headlight. On the other hand, in the charger 9,
A charge amount detecting means 12 for detecting the amount of electric power charged when charging the batteries 7, 7 is connected. The detected charge amount information obtained by the charge amount detection means 12 is displayed by the display device 1.
0 is input to the display control means 13 for display control. Further, the discharge power amount information detected by the discharge power amount detecting means 11 is also input to the display control means 13.

Next, a method of charging the batteries 7, 7 will be briefly described. As shown in FIG. 1, the charger 9 includes a charging circuit 9a and a charging control circuit 9b for controlling the operation of the charging circuit 9a. Then, the discharge amount information from the batteries 7, 7 detected by the discharge power amount detecting means 11 is input to the charge control circuit 9b, and the input discharge amount information is input to the charge control circuit 9b.
It is stored in the storage means provided for. Then, at the time of charging, the discharge amount information stored in the charge control circuit 9b is compared with the charge amount information obtained by the charge amount detecting means 12, and the charge amount information becomes equal to the discharge amount information. At this point, the charging method is switched so that the charging circuit 9a performs the charging while maintaining the predetermined current value set in advance. After the switching, when the amount of electric power obtained by multiplying the predetermined current value by a preset coefficient corresponding to the stored discharge amount or the like is charged, the charging is stopped.
With this charging method, a substantially constant fully charged state can be obtained even if the amount of dischargeable electric power remaining in the battery at the time of charging is different for each charging. It should be noted that the discharge power amount can be detected by integrating the voltage between the terminals of a predetermined resistor interposed in the discharge circuit of the batteries 7 and the time of the current flowing through the predetermined resistor. Can be obtained by integrating the time between the terminal voltage of the predetermined resistance interposed in the charging circuit 9a and the current flowing through the predetermined resistance.

Next, the display operation of the display device 10 will be described. The discharge power amount detecting means 11 stores the discharge power amount as information displayed on the display means 10 and stored in the storage means provided therein by a charging start signal from the charger 9 to set a predetermined value. Reset to a value, for example zero. Then, the display control means 13 adds the charge amount detected by the charge amount detection means 12 to the reset predetermined value, and the final charge amount in the charge operation is displayed on the display device 10. Displayed in analog form using a bar graph, etc. The display unit of the display device 10 also displays the travelable distance in a scale corresponding to the charge amount in the displacement range of the charge amount. And the display control means 1
In a fully charged state, 3 is displayed so that the travelable distance corresponds to, for example, 36 km, and the amount of discharge detected by the discharge power amount detection means 11 is subtracted from the display as the vehicle travels. I am trying to display the distance. In other words, the value obtained by subtracting the accumulated discharge power amount from the stored charge power amount is controlled to be displayed on the display device 10 as the remaining dischargeable amount.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a battery charging circuit and a battery capacity display circuit of a small electric vehicle.

FIG. 2 is an overall side view showing a small electric vehicle

[Explanation of symbols]

 7 Battery 9 Charger 10 Display Means 11 Discharged Electric Energy Detecting Means 13 Display Control Means

Claims (1)

[Claims] 1. A discharge power amount detecting means (11) for mounting a battery (7) and a charger (9) and integrating and detecting a discharge power amount from the battery (7) is provided. Display means (1) for displaying the value of the discharge electric energy accumulated based on the detection result of the electric energy detecting means (11).
0) is provided, the discharge power amount detection means (11) sets the discharge power amount on the display means (10) to a predetermined value by a charge start signal from the charger (9). A value obtained by adding the charging power amount to the reset predetermined value is displayed on the display means (10) as a value of the dischargeable power amount, and the battery (7) is reset from the displayed charging power amount value. A small electric vehicle provided with display control means (13) for displaying the remaining dischargeable electric energy on the display means (10) in a state in which the amount of discharged electric energy is reduced.