JPH04166779A - Apparatus for indicating consumption of battery - Google Patents

Abstract

PURPOSE:To indicate correct consumption by detecting an current supplied from a battery to a load, converting it to a digital value to accumulate at a constant time interval and computing the consumption of the battery. CONSTITUTION:A microcomputer device 5 detects the presence of a full charge signal when an electric source is switched on, makes the process of initialization when the signal is detected, and let an indicating lamp of an indicator 6 light at a prescribed number according to an addition area value of internal memory when it is not detected. Next, the device 5 reads the current value made A/D conversion at a constant time interval and adds cumulatively in an addition area. The device 5 let the indicating lamp turn on and off or generates alarm sounds when the discharge quantity arrives at the prescribed % of the full charge. The indication on consumption of a battery 2 is correctly made without the influence by a difference of sorts, makers, etc. of the batteries 2 and without a change by load fluctuation, etc. also by this.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a battery consumption display device suitable for a motorized vehicle that uses a battery as an energy source to travel, such as an electric wheelchair. .

[Conventional technology] For electric wheelchairs that use batteries, it is necessary to be able to return from the destination reliably, and it is also necessary to know in advance when it is time to charge the battery, so it is necessary to know the amount of battery consumption. It is important to know the distance you can drive. For this purpose, conventionally, the battery voltage is directly detected and the battery consumption is displayed from the relationship between the discharge amount and voltage characteristics.
It was designed to help you understand the distance you can travel and when you need to charge.

[Problems to be Solved by the Invention] However, with the means for displaying battery consumption in the above-mentioned conventional technology, there are differences in discharge amount and voltage characteristics due to differences in battery types and manufacturers. and battery voltage values do not necessarily match.

Therefore, when using a battery other than the one originally set, it was not possible to display accurate consumption. In addition, the battery voltage changes due to differences in load, changes or fluctuations in load, and similarly, accurate display is not possible.

The present invention was devised to solve the above-mentioned problems, and it is possible to reduce the amount of battery consumed by electric vehicles using batteries without being affected by differences in battery types, manufacturers, and load fluctuations. It is an object of the present invention to provide a battery consumption display device that can accurately grasp the battery consumption amount and accurately display the consumption amount.

[Means for Solving the Problems] The configuration of the battery consumption display device of the present invention for achieving the above object includes a means for detecting the current supplied from the battery to the load, and a means for digitally converting the detected current value. means for converting the digital value into a value; means for inputting the digital value at regular time intervals and accumulating and adding the product of the time interval and the digital value of the current value; and calculating the consumption amount of the battery from the accumulated value. and means for displaying the amount of battery consumption based on the calculated value.

[Operation] The present invention detects the current supplied from the battery to the load, converts it into a digital value, captures it at fixed time intervals, and accumulates and adds the product of the current value of the digital value and the time interval. By calculating the amount of battery consumption, it is possible to accurately grasp the amount of battery consumption without being affected by load fluctuations or differences between manufacturers, and to accurately display the amount of battery consumption.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

This embodiment will be described using an example in which the present invention is applied to an electric wheelchair.

In the configuration of this embodiment, 1 is a motor for driving the electric wheelchair, 2 is a rechargeable battery that supplies power to the motor 1, 3 is a resistor for current detection, and 4 is an analog-digital (hereinafter referred to as A/D) 5 is a microcomputer device, 6 is a display device, and 7 is a full charge signal when a charger is connected.

Resistor 3 is inserted in series between motor 1 and battery 2,
It is preferable that the value is the minimum value necessary to convert the current value into a voltage value to reduce loss due to heat generation. The input terminal of the A/D converter 4 is connected to both ends of the resistor 3, and the output of the A/D converter 4 converted into a digital value is connected to the input of the microcomputer device 5. The microcomputer device 5 has a timer means to take in the current value of the digital value at fixed time intervals, and has an arithmetic means and a constantly energized or battery-backed memory or non-volatile memory to read the current value of the digital value at regular intervals. It has a function of calculating the product of current values, adding it to an addition area on the memory and storing it, and a function of calculating the consumption amount based on the added value and outputting it to the display device 6.

The display panel of the display device 6 is constructed as shown in FIG.

In this configuration example, one indicator light 61, 62.63°64.65 using five light emitting diodes (LEDs) etc. is installed nearby.
Number them ~5 and arrange them in a line. This indicator light 61~
A fully charged state is indicated when all of 65 are turned on, and the indicator lights turn off starting with the larger number depending on the degree of consumption, and the consumption amount (remaining Ml) is displayed in five stages.

The operation and effect of the embodiment configured as above will be described.

FIGS. 3(a) and 3(b) are flowcharts showing the operating procedure of the microcomputer device 5 of the above embodiment.

(a) shows a normal continuous processing operation, and (b) shows an interrupt processing operation every second.

In (a), when the microcomputer device 5 starts operating due to power being turned on, etc., the value in the battery consumption addition area of the memory is set to 0 (zero).
, and performs initialization processing such as setting the number of lit indicator lights in the internal register to 5. Next, move on to normal cycle movement. In this operation, first, the charger's full charge signal 7 is checked to see if there is human power, and if the full charge signal 7 is present (Y), the above initialization process is performed, and then, if there is no full charge signal 7, it is N. ), proceed to the subsequent processing.

In the next process, look at the battery consumption in the addition area,
For example, 115 with a discharge amount of about 70% of a full charge is 5AH
(Ampere hour), judge whether it is 5AH or more, and if it is 5AH or more, set the value in the addition area to 0, subtract 1 from the number of lit indicator lights in the register, and after that, and in the above judgment. If it is less than 5AH, proceed to the next display process. Note that the above-mentioned judgment criterion 5AH is a value obtained by dividing the discharge amount required for charging by the number of display stages, and it is generally optimal to perform charging when the discharge amount is within about 70% of full charge. In the display process, the number of lit indicator lights of the register is determined, and if the number is 5, all indicator lights 61 to 65 are lit, if the number is 4, indicator lights 61 to 64 are lit, and if it is 3, the display is Lights 61 to 63 are lit, if it is 2, the indicator lights 61 and 62 are lit, if it is summer, the indicator light 61 is blinked as a warning, and if it is other than 1 to 5, the indicator light 61 is blinking and the electronic light is turned on. It is also possible to issue a warning that it is time to charge by intermittently ringing a buzzer or the like.

The cumulative battery consumption of the addition area in the above is
This is performed by interrupt processing at one second intervals as shown in (b). When there is an interrupt at one second intervals, the microcomputer device 5 first waits for the A/D converter 4 to complete the conversion and then reads the current value converted into a digital value. Subsequently, the current consumption value for one second is calculated from the product of the current value of the digital value and the time, and the current consumption value for one second is cumulatively added to the addition area, and the process returns to the above-mentioned process (a). Due to the above, the addition area consumes battery!
l (AH) is obtained, and the battery consumption of the addition area is saved by normal energization of the control circuit of the microcomputer device 5 including the memory, battery backup of the memory, use of non-volatile memory, etc., and the above-mentioned (a ) is used in processing.

According to this embodiment, the current flowing from the battery to the load can be detected, and the product of the current and time can be accumulated to obtain a substantially equal amount of current consumption. It is possible to accurately grasp the amount of battery consumption regardless of the difference in battery or manufacturer, and it is possible to display the amount of battery that can be discharged in five stages. Users of electric wheelchairs can use the display to know whether or not they can travel to their destination.
You can reliably go to and return to a predetermined location. In addition, the blinking of the last indicator light will alert you and allow you to charge the battery at an appropriate time.

In the above embodiment, when a full charge signal cannot be obtained from the charger, it is also possible to detect the connection of the charger and perform initialization processing.

Furthermore, various types of detection means for detecting the current supplied from the battery to the load can be used, such as one that uses induction without connection. In addition, the display device can increase or decrease the number of display stages depending on the capacity of the battery, or display the amount of battery consumption converted to the distance that can be traveled, or use a digital display. can. Of course, the present invention is also applicable to other electric vehicles such as forklifts.

As described above, the present invention can be applied in various ways and can take various embodiments in accordance with the gist thereof.

[Effects of the Invention] As is clear from the above explanation, according to the battery consumption display device of the present invention, the display regarding battery consumption is not affected by differences in battery type, manufacturer, etc.
In addition, it does not change due to load fluctuations, etc., and can be performed accurately.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing an example of the configuration of a display panel of the display device of the above embodiment, and FIG.
Figures (a) and (b) are flowcharts showing the operating procedure of the microcomputer of the above embodiment. 1...Motor, 2...Battery, 3...Resistance,
4... Analog-digital converter, 5... Microcomputer device, 6... Display device, 7... Full charge signal. Figure 2

Claims (1)

[Claims] (1) means for detecting the current supplied from the battery to the load; means for converting the detected current value into a digital value; and means for calculating the battery consumption amount from the accumulated value and displaying the battery consumption amount based on the calculated value. Battery consumption display device.