JPH0554916A - Determination of residual battery energy - Google Patents

Abstract

PURPOSE:To determine a residual battery energy by use of a voltage value measured on the cell telephone movable unit side regardless of the sort of a battery or its charge/discharge condition. CONSTITUTION:A cell type telephone movable unit 1 comprises a display part 2, an operation part 3, an A/D converter 4, and a telephone movable unit control part 5, a voltage of a battery 6 is measured using the A/D converter 4, and a residual battery energy is determined using the result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery energy remaining amount determining method used in a cell phone mobile unit or the like.

[0002]

2. Description of the Related Art Conventionally, this kind of battery energy remaining amount determination method has previously determined a coefficient corresponding to the load current state, and uses this coefficient to correct the measured voltage value.
The battery energy remaining amount is determined based on this result.

[0003]

However, in the above-mentioned conventional battery energy remaining amount determination method, a fixed coefficient is used for the type of battery and the load current state to correct the determination voltage. When using different types of batteries together, there is a problem that it is not possible to accurately determine the remaining battery energy. Further, in the above case, since the voltage cannot be accurately corrected, there is a problem that the charged / discharged state of the battery cannot be determined using the corrected voltage value. The present invention solves such a conventional problem, and when using a plurality of types of batteries, it is possible to determine an accurate battery energy remaining amount in consideration of charge / discharge states of the batteries. It is an object of the present invention to provide a battery energy remaining amount determination method capable of performing the above.

[0004]

In order to achieve the above object, the present invention first detects a change in the load current state, and then detects the battery voltage value before the change in the load current state and the battery voltage value after the change in the load current state. By obtaining the difference from the value, it is used as a coefficient for voltage value correction. It should be noted that this coefficient is sequentially and relatively calculated when the load current state changes. After that, the measured voltage value is corrected using the coefficient relatively obtained as described above.

[0005]

Therefore, according to the present invention, the following effects are provided. (1) Since the charge / discharge characteristics peculiar to the type of battery used are not bound, the same algorithm can be used to determine the remaining battery energy even when using multiple batteries together, which is convenient. high. (2) Since it is not necessary to sequentially correct the voltage change during charging / discharging due to the temperature change of the battery with respect to the measured voltage, temperature correction of the battery voltage is substantially facilitated. (3) Regardless of the type of battery, it is possible to judge the switching from the charging state to the discharging state and the switching from the discharging state to the charging state based on the battery voltage. It is possible to determine the amount.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of a battery energy remaining amount determining method according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a cell phone mobile unit, which includes a display unit 2, an operation unit 3, an A / D converter 4, and a mobile phone unit control unit 5. Reference numeral 6 is a battery for driving a mobile phone, and 7 is a battery charger. FIG. 2 shows a processing flow of the telephone mobile unit control section 5, and FIGS. 3 and 4 are diagrams for explaining the operation of the present invention.

Next, the operation of the above embodiment will be described with reference to FIG. 1, FIG. 3, FIG. First, mobile phone 1
The presence / absence of a change in the load current state determined inside is detected (S ₁ ). Next, the voltage value of the battery 6 is obtained as a digital value using the A / D converter 4 (S ₂ ). If it is determined in the process of S ₁ that the load current state has changed, a process for obtaining a correction coefficient of the voltage value is performed (S ₃ ), and the process of S _{1 is performed.}
If it is determined that the load current state has not changed in
A process of correcting the measured voltage obtained by the process of S ₂ using the obtained correction coefficient is performed (S ₄ ). Above S ₃ and S ₄
A process for determining whether the battery is in a charging state or a discharging state using the corrected data obtained by the process
(S ₅ ) and a process for determining the remaining battery energy (S ₆ ) are performed.

The calculation process of the voltage value correction coefficient is shown in FIG.
Details of (S ₃ ) and the process of correcting the measured voltage (S ₄ ) will be described. Figure 3 shows the battery voltage measurement over time (S ₂ ).
It is an example of a change in the measured voltage depending on the processing.
The change in the measured voltage at times t ₁ and t ₄ in FIG.
There shall be attributed to the change in the load current state, time t _2,
change in the measured voltage at t ₃ is due to the consumption of the battery energy. Here, when the voltage of the load current state 1 (FIG. 3) assuming that the state of the reference, the time t _a, the correction coefficient [Delta] V _a at t _b, [Delta] V _b and the corrected voltage V _a, V _b are the following respective Like At time t _a,

[0009]

[Equation 1]

[0010]

[Equation 2]

Further, at time t _b

[0012]

[Equation 3]

[0013]

[Equation 4]

That is, the correction coefficient is the load current change detection processing.
It is determined by the difference between the measured voltage value before the change and the measured voltage value after the change and the correction coefficient before the change when it is determined by (S ₁ ) that there is a change in the load current. correction coefficient calculating process (S ₃₎ is carried out in). In the measurement voltage correction processing (S _4), by finding the sum of the correction coefficient and the measured voltage value determined by the voltage value correction coefficient calculation process (S _3), to correct the battery voltage. That is,
The corrected battery voltage value indicates the difference between the reference voltage value (the last measured voltage value in the reference load current state) and the voltage value reduced by the consumption of battery energy.

Next, referring to FIG. 4, the process of determining the charge / discharge state of the battery of FIG. 2 (S ₅ ) will be described. FIG. 4 shows the relationship of the corrected battery voltage obtained by the process of S ₅ when the charging / discharging state changes. In the charging / discharging state determination process (S ₅ ), it is determined that the discharging state has changed to the charging state when the corrected battery voltage increases by a certain amount (ΔV _J ) or more within a certain time (Δt _J ). , And likewise for a fixed time (Δ
When the corrected battery voltage decreases to a certain amount (ΔV _H ) or less within t _H ), it is determined that the charging state is changed to the discharging state. Therefore, at time t ₁ + Δt _J , V ₂ −V ₄ (>
ΔV _J ) is required to increase, and it is determined that charging is in progress thereafter. Further, at time t ₂ + Δt _H , V ₁ −V ₃ (> Δ
V _H ) is required to be decreased, and thereafter it is determined that discharging is in progress. Battery energy remaining amount determination process of FIG.
(S ₆ ) is a process of determining the level to be displayed on the display unit 2 to indicate the remaining amount of battery energy by the operation of the user of the cell phone mobile unit. That is, from the threshold value of n voltage values individually determined by the charging / discharging state obtained in the charging / discharging state determination process (S ₅ ) of the battery and the load current change detection process (S ₁ ), the measured voltage correction process (S ₄ ) Is a process of determining the level to be displayed in n + 1 stages from the relationship of the corrected battery voltage value obtained in ().

[0016]

EFFECTS OF THE INVENTION The present invention has the following effects, as is apparent from the above embodiments. (1) Since it is not necessary to use a fixed value as a coefficient for voltage correction, an accurate battery energy remaining amount can be determined regardless of the difference in battery type.

(2) The charge / discharge state of the battery can be easily detected, and the result can be used to accurately determine the battery energy in the charge / discharge state.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a battery energy remaining amount determination method according to an embodiment of the present invention.

FIG. 2 is a processing flowchart of a telephone mobile unit control unit according to the embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of the present invention.

FIG. 4 is a diagram for explaining the operation of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cellular telephone mobile device, 2 ... Display unit, 3 ... Operation unit,
4 ... A / D converter, 5 ... Telephone mobile unit control unit, 6 ... Battery, 7 ... Charger.

Claims (2)

[Claims] 1. A method for determining the remaining battery energy, which comprises detecting a change in a load current state and a change in a battery voltage state and using the detection result. 2. A method for determining the charge / discharge state of a battery by detecting a change in the battery voltage state, and estimating the remaining amount of battery energy in consideration of the charge / discharge state based on the determination result. The battery energy remaining amount determination method according to claim 1, which is characterized in that.