TW201341806A - Low voltage alarm method for secondary battery of vehicles and apparatus thereof - Google Patents

Abstract

The object of the invention is to provide a low voltage alarm method for secondary battery of vehicles and apparatus thereof. The method includes the steps of: a voltage detection step: starting to detect the voltage of the secondary battery after a certain period of time that the voltage of the secondary battery requires for reaching a substantially stable state upon the vehicle stops charging the secondary battery; a storage step: storing the detected voltages as a sampling voltages Vs after detecting the voltage of the secondary battery; a comparison judgment step, comparing the sampling voltage Vs with a predetermined threshold voltage Vth, and determining whether the sampling voltage Vs is smaller than or equal to the predetermined threshold voltage Vth; and an output step, outputting a warning when the sampling voltage Vs is determined to be smaller than or equal to the predetermined threshold voltage Vth in the comparison judgment step.

Description

Low voltage warning method for vehicle secondary battery and device thereof

The present invention relates to a low voltage warning method for a secondary battery for a vehicle and an apparatus therefor.

For a long time, vehicles such as steam locomotives have used secondary batteries such as lead-acid batteries to supply power. The so-called secondary battery is a battery that can be used after being discharged by charging, and is also called a battery or a battery. However, with the increase in the number of times and time of use, or the long-term placement of secondary batteries, their storage capacity is gradually degraded. When the battery's storage capacity degrades to its normal storage capacity, the end of life is declared (the definition of end-of-life is different depending on where it is used, because the amount of electricity required to start the vehicle is higher. Therefore, the term "end of life" as used in the description of the present invention means that the secondary battery can no longer be used to start the vehicle engine, but the battery that reaches the "end of life" may still be available to illuminate the vehicle with lower power demand. Lights, etc.).

Generally, when the vehicle is started, the trigger of the start switch is pressed by the user, and the battery of the vehicle is powered to the starter motor to drive the engine to start the engine. Therefore, when the battery's storage capacity is insufficient, it will face the dilemma of not being able to start the vehicle. It is necessary to monitor the life status of the battery and alert the user when the battery is near the end of its life.

In general, the life of a secondary battery can be estimated by detecting the internal resistance value, the capacity of the battery, or the voltage of the secondary battery. However, the internal resistance value needs to be detected by a special instrument, and the capacity of the secondary battery is affected by many factors, including the structural composition of the battery itself (the number of cells, the size of the battery and the size of the plate), the ambient temperature, The previous discharge depth of the battery, the self-discharge of the battery itself, the discharge current of the battery, the method of charging the battery, the discharge cut-off voltage, and the operation method of the battery. And because of the change in battery capacity of the secondary battery during discharge and the non-linear function, it is more difficult to estimate the battery life. Therefore, in the above various methods for detecting the battery life state, the method for detecting the secondary battery voltage is relatively simple.

Referring to Fig. 1, Fig. 1 is a graph showing changes in the voltage of a secondary battery of a vehicle. The interval A refers to when the main switch of the vehicle is off (M/S OFF) and the engine is off (E/G OFF), at which time the secondary battery voltage is maintained at a fixed normal value (for example, 13V); the main switch of the vehicle After turning on (M/S ON), enter the B section. At this time, the secondary battery voltage will remain unchanged. When the engine starts (E/G start), it enters the C section. At this time, the secondary battery voltage will be affected. Start the motor to activate the relationship and drop sharply. After the engine starts, it will gradually rise. When the vehicle is running, enter the D section. At this time, because the engine drives the generator to charge the secondary battery, the secondary battery voltage will rise to a slightly higher. The fixed value of the normal value is then substantially unchanged; until the engine is turned off (E/G OFF) and the main switch is turned off (M/S OFF), the E zone is entered. At this time, the vehicle stops charging the secondary battery. The secondary battery voltage will gradually drop to the normal value; when the secondary battery voltage reaches a substantially stable state, it enters the F interval, and the F interval is actually the A interval.

In the prior art, the battery life state has been detected based on the secondary battery voltage. It continuously detects the secondary battery voltage from the time when the main switch of the vehicle is turned on (M/S ON) until the main switch is turned off (M/S OFF) (that is, the interval B to D of Fig. 1) When the secondary battery voltage is less than a predetermined threshold, an alert state is displayed to alert the user.

However, the secondary battery voltage of the vehicle is not a constant value, which varies with the state of the vehicle.

Therefore, although the above-mentioned prior art can simply detect the secondary battery voltage and alert the user, as described above, the secondary battery voltage varies with the state of the vehicle, wherein the engine in the interval C of FIG. The secondary battery voltage will drop sharply and will gradually recover after the engine starts. If the battery has not reached the end of its life, because the secondary battery voltage drops sharply below the predetermined low voltage warning value when the engine is starting, even if the battery does not reach the end of life, there will be a warning that the end of the battery life will be caused. The end of life of the user's battery may not be properly alerted.

In view of the above, the present invention is directed to a low voltage warning method and apparatus for a secondary battery for a vehicle that is simple, accurate, and reliable in detection.

Specifically, the first invention of the present invention is a low voltage warning method for a secondary battery for a vehicle, comprising: a voltage detecting step, which is performed after the vehicle stops charging the secondary battery After the voltage of the secondary battery reaches a certain time required for the approximate timing, the voltage of the secondary battery is detected; and the storing step is to detect the voltage of the secondary battery after detecting the voltage of the secondary battery. As a sampling voltage; a comparison determining step of comparing the sampling voltage with a predetermined threshold voltage and determining whether the sampling voltage is less than or equal to the predetermined threshold voltage; and an outputting step, which is in the comparison determining step When the sampling voltage is judged to be less than or equal to the predetermined threshold voltage, an alarm is output.

According to the above configuration of the present invention, since the detection is performed in such a manner as to detect the voltage of the secondary battery, and the voltage of the secondary battery is detected after the voltage of the secondary battery reaches a substantially stable state, the voltage can be detected in an easy manner. The detection is performed, and the misjudgment of the end of the battery life can be prevented, and the voltage of the secondary battery for the vehicle can be accurately and reliably detected and the warning is issued.

According to a second aspect of the invention, the low voltage warning method of the first aspect, wherein the vehicle stops charging the secondary battery by closing the main switch of the vehicle; the comparison determining step is The comparison and determination are made when the main switch of the vehicle is turned on, and the detection of the voltage of the secondary battery is stopped.

According to the above configuration of the present invention, since the comparison judging step is performed when the main switch is turned on, the current consumption in the standby state can be reduced, and the burden on the battery can be reduced.

According to a third aspect of the invention, the low voltage warning method of the first aspect, wherein the specific time required for the secondary battery to reach the stabilization is from the stop of charging the secondary battery to the voltage of the secondary battery The time until the rate of change is greater than or equal to -0.001 V/min.

According to the above configuration of the present invention, it is possible to more accurately start detecting the voltage after the voltage of the secondary battery reaches a stable state, thereby preventing misjudgment of the end of battery life.

According to a fourth aspect of the invention, the low voltage warning method of the first aspect, wherein the specific time required for the secondary battery to reach stability is substantially one hour.

According to the above configuration of the present invention, it is possible to more accurately start detecting the voltage after the voltage of the secondary battery reaches a stable state, thereby preventing misjudgment of the end of battery life.

A low voltage warning method according to any one of the preceding claims, wherein the voltage detecting step is performed at a predetermined period after detecting the voltage of the secondary battery The voltage of the secondary battery is continuously detected at intervals.

According to the above configuration of the present invention, since the voltage of the secondary battery is continuously detected at predetermined periodic intervals, it is ensured that the sampling voltage for comparison with the predetermined threshold voltage is the most recently detected when the main switch is turned on. The voltage, not the voltage detected before it is too long, correctly and reliably detects whether the voltage of the secondary battery for the vehicle is too low and gives a warning.

The invention of claim 6 is the low voltage warning method of item 5, wherein the predetermined period interval is 30 minutes.

According to the above configuration of the present invention, the voltage of the secondary battery can be detected at regular intervals, so that the current consumption in the standby state can be reduced, the burden on the battery can be reduced, and the frequency can be accurately and reliably detected in consideration of the updated frequency. Whether the voltage of the secondary battery is too low and gives a warning.

According to a seventh aspect of the invention, the low voltage warning method of the fifth aspect, wherein the storing step is to update the sampling voltage to a newly detected each time the voltage of the secondary battery is detected. This voltage.

According to the above configuration of the present invention, since each time the voltage of the secondary battery is detected, the stored sampling voltage is updated to the newly detected voltage, and at the same time, the vehicle is correctly and reliably detected. Whether the voltage of the battery is too low and a warning is issued, so that when only one sampling voltage needs to be stored, the storage space can be saved.

The invention provides the low voltage warning method according to any one of the items 1 to 7, wherein the outputting step displays a warning in a portion of the original display current time and displays a warning on the predetermined display. After the time has elapsed, switch back to display the current time.

According to the above configuration of the present invention, since the warning is displayed in the portion where the current time is displayed, the additional output portion is not required to be additionally output to output an alarm, and the configuration and the arrangement space of the output portion can be simplified.

According to a twelfth aspect of the invention, a low voltage warning device for a secondary battery for a vehicle includes: a voltage detecting unit that passes a voltage of the secondary battery from when the vehicle stops charging the secondary battery After the specific time required for the approximate timing is reached, the voltage of the secondary battery is detected; the storage unit stores the voltage of the secondary battery detected by the voltage detecting unit, and uses the same as the sampling voltage. a comparison determining unit that compares the sampled voltage stored in the storage portion with a predetermined threshold voltage, and determines whether the sampled voltage is less than or equal to the predetermined threshold voltage; and the output portion is determined by comparison When the portion judges that the sampling voltage is less than or equal to the predetermined threshold voltage, the warning is output.

According to the above configuration of the present invention, since the detection is performed in such a manner as to detect the voltage of the secondary battery, and the voltage of the secondary battery is detected after the voltage of the secondary battery reaches a substantially stable state, the voltage can be detected in an easy manner. The detection is performed, and the misjudgment of the end of the battery life can be prevented, and the voltage of the secondary battery for the vehicle can be accurately and reliably detected and the warning is issued.

According to a thirteenth aspect of the invention, the low voltage warning device of item 12, wherein: the vehicle stops charging the secondary battery by closing the main switch of the vehicle; the comparison determining unit is The comparison and determination are made when the main switch of the vehicle is turned on and the detection of the voltage of the secondary battery is stopped.

According to the above configuration of the present invention, since the comparison judging step is performed when the main switch is turned on, the current consumption in the standby state can be reduced, and the burden on the battery can be reduced.

The invention of claim 14 is the low voltage warning device of item 12, wherein: the specific time required for the secondary battery to reach stability is from the stop of charging the secondary battery to the voltage of the secondary battery The time until the rate of change is greater than or equal to -0.001 V/min.

According to the above configuration of the present invention, it is possible to more accurately start detecting the voltage after the voltage of the secondary battery reaches a stable state, thereby preventing misjudgment of the end of battery life.

According to a fifteenth aspect of the invention, the low voltage warning device of item 12, wherein the specific time required for the secondary battery to reach stability is substantially one hour.

According to the above configuration of the present invention, it is possible to more accurately start detecting the voltage after the voltage of the secondary battery reaches a stable state, thereby preventing misjudgment of the end of battery life.

A low voltage warning device according to any one of the items 12 to 15, wherein the voltage detecting unit is in a predetermined period after detecting the voltage of the secondary battery. The voltage of the secondary battery is continuously detected at intervals.

According to the above configuration of the present invention, since the voltage of the secondary battery is continuously detected at predetermined periodic intervals, it is ensured that the sampling voltage for comparison with the predetermined threshold voltage is the most recently detected when the main switch is turned on. The voltage, not the voltage detected before it is too long, correctly and reliably detects whether the voltage of the secondary battery for the vehicle is too low and gives a warning.

The invention of claim 17 is the low voltage warning device of item 16, wherein: the predetermined period interval is 30 minutes.

According to the above configuration of the present invention, the voltage of the secondary battery can be detected at regular intervals, so that the current consumption in the standby state can be reduced, the burden on the battery can be reduced, and the frequency can be accurately and reliably detected in consideration of the updated frequency. Whether the voltage of the secondary battery is too low and gives a warning.

The invention of claim 18 is the low voltage warning device of item 16, wherein the sampling voltage stored in the storage portion is updated to new each time the voltage of the secondary battery is detected The voltage detected.

According to the above configuration of the present invention, since each time the voltage of the secondary battery is detected, the stored sampling voltage is updated to the newly detected voltage, and at the same time, the vehicle is correctly and reliably detected. Whether the voltage of the battery is too low and a warning is issued, so that when only one sampling voltage needs to be stored, the storage space can be saved.

The invention is the low voltage warning device according to any one of the items 12 to 18, wherein the output portion displays a warning in a portion of the original display current time and displays a warning on the predetermined display. After the time has elapsed, switch back to display the current time.

According to the above configuration of the present invention, since the warning is displayed in the portion where the current time is displayed, the additional output portion is not required to be additionally output to output an alarm, and the configuration and the arrangement space of the output portion can be simplified.

Embodiments of the present invention will be described in detail below with reference to the drawings.

[Summary of Low Voltage Warning Device]

Referring first to FIG. 2 and FIG. 3A, FIG. 2 is a block diagram showing a low voltage warning device for a secondary battery according to an embodiment of the present invention, and FIG. 3A is a view showing a low voltage of a secondary battery according to an embodiment of the present invention. A schematic diagram of the warning device.

The low voltage warning device for a secondary battery according to an embodiment of the present invention mainly has a voltage dividing circuit 4, an MCU (Micro Control Unit) 1 and an output unit 2. The MCU 1 includes a voltage sampling circuit 11, a voltage comparator 12, an A/D converter (analog/digital converter) 13, a bus bar 14, an ALU (Arithmetic Logic Unit) 15, and a flash memory 16. The output unit 2 may be a liquid crystal display. However, the output unit 2 may be an element that can alert the user, such as an LED display or a speaker.

The hardware operation of the low voltage warning device for the secondary battery of one embodiment of the present invention will be explained below.

First, since the voltage of the secondary battery 3 is generally about 12 V, the MCU 1 cannot accept such a high input voltage, so the MCU 1 obtains the voltage of the secondary battery 3 via the voltage dividing circuit 4. After the small voltage signal generated by the voltage dividing circuit 4 is divided into the MCU 1, the voltage sampling circuit 11 performs voltage sampling, and then the voltage comparator 12 compares with a preset reference voltage value, and then passes through the A/ The D converter 13 converts the analog voltage signal into a digital voltage signal. At this time, the ALU 15 obtains the converted digital voltage signal (that is, the sampling voltage Vs in the processing flow of the low voltage warning described later) via the internal bus 14 and stores it in the flash memory 16. The predetermined flash voltage Vth is also stored in the flash memory, and the predetermined threshold voltage Vth is set to a voltage value indicating that the end of the life of the secondary battery 3 is to be alerted, and is usually set to be less than 13V. In the present embodiment, the predetermined threshold voltage Vth is set to 12V. The ALU 15 is responsible for executing the processing flow of the low voltage warning as will be described later, and based on the calculation result, the control output unit 2 alerts the user or displays the voltage value of the secondary battery 3 that was detected last time. The output unit 2 of the present embodiment employs a liquid crystal display. As shown in FIG. 3A, in the present embodiment, the portion of time displayed on the dashboard 10 of the vehicle is used as the output unit 2.

3B to 3D, FIG. 3B is a partial enlarged view of the instrument panel 10 of the vehicle of FIG. 3A. Fig. 3C is an enlarged view of the output portion 2 of Fig. 3B. Figure 3D is an enlarged view of the reset button 6 of Figure 3A.

As shown in FIG. 3B and FIG. 3C, in order to simplify the display of the instrument panel 10 of the vehicle, in the embodiment of the present invention, a portion of the original display time on the dashboard 10 of the vehicle is used as the output portion 2 to display a low voltage warning. However, the output unit 2 for displaying a low voltage warning is additionally disposed on the instrument panel 10 of the vehicle without using the configuration of the time on the dashboard 10 of the vehicle.

In an embodiment of the present invention, as shown in FIG. 3D, a reset button 6 is disposed on the dashboard of the vehicle. In the embodiment of the present invention, the reset button 6 is used for the user to display twice. The indication of the voltage value of the battery 3, for example, when the user wants to know the sampling voltage Vs of the secondary battery 3 detected last time, the user can turn on the main switch (not shown) With the button 6, the sampling voltage Vs is displayed on the output unit 2.

[Processing process of low voltage warning]

Referring next to FIG. 4, FIG. 4 is a flow chart showing a low voltage warning method for a secondary battery according to an embodiment of the present invention.

According to the present invention, after the vehicle stops charging the secondary battery (i.e., after the main switch is turned off in the embodiment of the present invention), the voltage of the secondary battery 3 gradually drops to a normal value, and enters the interval F of FIG. After the voltage of 3 has reached a stable state, the voltage of the secondary battery 3 is sampled. After that, after the main switch of the vehicle is turned on, it is judged whether or not the warning is necessary according to the detected voltage of the secondary battery 3. The specific steps of the embodiment of the present invention are as shown in the flow chart of FIG. 4. When the main switch of the vehicle is turned off (the condition for starting the process), the low voltage warning determination process of steps S1 to S13 is started.

Generally speaking, when the engine of the vehicle is running, the generator will be driven, and the generator will charge the battery. Therefore, when the main switch of the vehicle is turned off, the engine will stop running, and the generator will stop running, so it will stop. The secondary battery 3 is charged. Therefore, the present invention can adopt the time point when the main switch of the vehicle is turned off as the time point at which the vehicle stops charging the secondary battery. However, the present invention is not limited thereto, and the time when the vehicle stops the charging of the secondary battery as the vehicle is stopped may be used. .

First, in step S1, the update flag stored in the flash memory 16 is reset to 0, indicating that the sampled voltage Vs stored in the flash memory 16 has not been updated. Next, in step S2, it is determined whether a specific time has elapsed since the main switch of the vehicle was turned off. This is a method for determining whether the voltage of the secondary battery 3 has reached a substantially stable state since it is used in the present embodiment. This specific time is set to 1 hour.

That is, the present invention is based on the F section of Fig. 1, that is, when the voltage of the secondary battery 3 has reached a substantially stable state, the detection of the voltage is started. Therefore, according to the type of the secondary battery 3 used in the vehicle, the secondary battery 3 used can be obtained after the main switch is turned off and the voltage is lowered to a stable value according to the change characteristic map of the secondary battery 3 obtained in advance. The normal time, and the step S2 of the present invention is appropriately set to determine whether the specific time has elapsed since the main switch of the vehicle was turned off to obtain the effect of the present invention. Therefore, the present invention is not limited to the one hour described in the embodiment, and the specific time may be appropriately set to be, for example, 30 minutes or 2 hours according to the change characteristic diagram of the secondary battery 3, or may be closed by the main switch of the self-vehicle. The time until the voltage change rate of the secondary battery 3 is greater than or equal to a predetermined value, for example, -0.001 V/min, is judged as the time for determining whether or not the voltage of the secondary battery 3 has reached the stable state.

In step S2 of the embodiment, if it is determined that the elapsed time since the main switch of the vehicle is turned off is greater than or equal to 1 hour (YES in step S2), the process proceeds to step S3; if the elapsed time since the main switch of the vehicle is turned off If it has not completed 1 hour (step S2, NO), the process proceeds to step S10. In step S10, it is determined whether the main switch of the vehicle is turned on, and if it is turned on (YES in step S10), the process proceeds to step S6, and if the main switch has not been turned on (NO in step S10), the process returns to step S2.

In step S3, the update flag stored in the flash memory 16 is first set to 1, indicating that the sampling voltage Vs is updated, and then proceeds to step S4. In step S4, the voltage of the secondary battery 3 is detected as the sampling voltage Vs, and the sampling voltage Vs is stored in the flash memory 16. Here, when the sampling voltage Vs is stored in the flash memory 16, the last recorded sampling voltage Vs may be overwritten, so that only one sampling voltage Vs is maintained in the flash memory 16.

Next, it is determined in step S5 whether the main switch of the vehicle is turned on, and if it is turned on (YES in step S5), the process proceeds to step S6, and if it is not already turned on (NO in step S5), the process proceeds to step S11, where it is determined from the previous detection. Whether the voltage of the secondary battery has passed more than 30 minutes, and if it has passed 30 minutes or more (YES in step S11), the process returns to step S4 to detect and update the sampling voltage Vs again. That is, in this embodiment, the sampling voltage Vs is updated at a sampling frequency once every 30 minutes, but the sampling frequency is not limited thereto, and may be once every 10 minutes, once every 20 minutes, once every hour, etc. If it has not been 30 minutes since the last detection of the voltage of the secondary battery (NO in step S11), the process returns to step S5 to determine whether the main switch of the vehicle is turned on.

The period during which the voltage of the secondary battery 3 is detected in this embodiment is one hour after the main switch of the vehicle is turned off until the main switch of the vehicle is turned on, in other words, the voltage sampling of the secondary battery 3 is stopped after the main switch is turned on. .

Specifically, in step S5 and step S10, if it is determined that the main switch of the vehicle is turned on, the detection of the voltage of the secondary battery 3 is stopped, and the process proceeds to step S6 to determine whether the detected sampling voltage Vs is less than or It is equal to a predetermined threshold voltage Vth. The predetermined threshold voltage Vth is previously stored in the flash memory 16. In step S6, the sampling voltage Vs stored in the flash memory 16 and the predetermined threshold voltage Vth are compared, and it is determined whether the sampling voltage Vs is less than or equal to a predetermined threshold voltage Vth, and if the sampling voltage Vs is less than or equal to the threshold When the voltage Vth (YES in step S6), an alarm is output (step S7), and if the sampling voltage Vs is greater than the threshold voltage Vth (step S6, NO), the process proceeds to step S12.

In step S7, since the detected voltage of the secondary battery 3 is less than or equal to the predetermined threshold voltage Vth, indicating that the end of the life of the secondary battery 3 is approaching, an alert is issued to alert the user. The method of warning can be presented by visual display, or can be triggered by, for example, a sound of "哔" issued several times. In this embodiment, a flashing battery pattern is used as a warning, and as described above, it is displayed in the original time. The part shows the flashing battery pattern and the detected threshold voltage Vth. Then, in step S8, it is judged whether the display of the warning has not exceeded 30 seconds, and if the time for displaying the warning is less than or equal to 30 seconds (YES in step S8), the process returns to step S7 to continue to display the warning; if the time for displaying the warning has exceeded 30 seconds (No in step S8), the display time is switched back, and the display of the warning is stopped (step S9). In this embodiment, the display time of the alert is 30 seconds. However, the display time of the alert may be, for example, 15 seconds, 1 minute, or the like.

The above is the main processing flow of the low voltage warning. However, in view of the fact that the user may still know the sampling voltage Vs measured last time without displaying the warning, to control the state of the secondary battery 3 of the vehicle at any time, the user is provided. The sampling voltage Vs stored in the flash memory 16 can be read and displayed by pressing the reset button 6, and the flow will be explained below.

When it is determined in step S6 that the sampling voltage Vs of the secondary battery 3 exceeds the threshold value, the process proceeds to step S12, in which it is determined whether or not the reset button 6 is pressed, and if pressed (YES in step S12) The sampling voltage Vs stored in the flash memory 16 is displayed. In the present embodiment, the sampling voltage Vs is displayed in the portion of the original display time. If the reset button 6 is not pressed again, the state in which the sampling voltage Vs is displayed is maintained, and when the reset button 6 is pressed again, the display portion is restored to the state of the original display time. In addition to this, it is also possible to automatically switch back to the display time when the sampling voltage Vs is displayed for a certain period of time, for example, 3 seconds.

[Display of low voltage warning]

According to the processing flow of the low voltage warning, an embodiment of the present invention displays the low voltage warning and the sampling voltage Vs in a plurality of different situations, and the embodiment also informs the user of the displayed content through different display modes. Represents the outcome of the situation. The various aspects of the embodiments of the present invention are explained below.

Referring to Figure 5, there is shown a schematic diagram showing the output of a low voltage warning device in accordance with an embodiment of the present invention.

As shown in FIG. 5, the output unit 2 according to an embodiment of the present invention further includes a sample voltage display unit 21, an update mark display unit 22, and a battery pattern display unit 23. The sampling voltage display unit 21 is for displaying the sampling voltage Vs of the secondary battery 3 recorded in the flash memory 16, that is, in step S6, when it is determined that the sampling voltage Vs is less than or equal to a predetermined threshold (steps) When S6 is YES, or when the user presses the reset button 6 in the above step S12 and proceeds to step S13, the sampling voltage display portion 21 displays the sampling voltage of the secondary battery 3 recorded in the flash memory 16. Vs. The sampling voltage display unit 21 of the present embodiment displays the two-digit plus the sampling voltage Vs of the first decimal place using the two-digit portion of the original display time, the colon portion, and the ten-digit portion of the minute.

The update mark display unit 22 determines whether to display the update flag according to the update flag stored in the flash memory 16. If the update flag is 0, the sampled voltage Vs has not been updated, and the update flag is not displayed. Marked as 1, indicating that the sampling voltage Vs has been updated, the update flag is displayed, and after 3 seconds, the update flag is not displayed. Further, the update mark display portion 22 in the present embodiment displays a bottom line as an update mark using the single digit portion of the minute of the original display time.

The battery pattern display unit 23 additionally displays a battery pattern on the right side of the portion of the original display time, that is, in step S6, when it is determined that the sampling voltage Vs is less than or equal to the predetermined threshold value (step S6, YES), the step In S7, the battery pattern display portion 23 displays the battery pattern in a blinking manner, for example, to issue an alert to remind the user that the end of life of the secondary battery 3 is approaching; if the sampling voltage Vs is greater than a predetermined threshold, in the foregoing step S12 When the user presses the reset button 6 and proceeds to step S13, in addition to displaying the sampling voltage Vs of the secondary battery 3 recorded in the flash memory 16, the battery pattern display portion 23 may be in a normal manner. The battery pattern is displayed (for example, not flashing) to inform the user that the secondary battery 3 has not yet reached the end of its life. On the other hand, when the user does not press the reset button 6 in the above step S12, the battery pattern display unit 23 does not display.

Referring next to Fig. 6, there is shown a schematic diagram showing various aspects of a low voltage warning device in accordance with an embodiment of the present invention.

When the low voltage warning device of the embodiment of the present invention turns on the main switch of the vehicle, it is determined that the sampling voltage Vs stored in the flash memory 16 is less than or equal to a predetermined threshold, or the reset button 6 is used by the user. When pressed, that is, when the process proceeds to step S7 or step S13 in Fig. 4, the ALU 15 controls the output unit 2 to display the sampling voltage Vs recorded in the flash memory 16, and displays a low voltage warning as appropriate.

As shown in Fig. 6, the output aspect of the output section 2 depends on whether the sampling voltage Vs is greater than the threshold value and whether the sampling voltage Vs has been updated.

When the update flag stored in the flash memory is 1, indicating that the sampling voltage Vs stored in the flash memory 16 has been updated, if the sampling voltage Vs is less than or equal to the threshold value, the output unit 2 outputs the display state. A. In the display aspect A, the sampling voltage display unit 21 initially displays the sampling voltage Vs, the update flag display unit 22 displays the update flag, and the battery pattern display unit 23 displays the battery pattern in a blinking manner to alert the user (display) Aspect A-1). After a certain period of time, for example, 3 seconds, the update flag is turned off. At this time, the sample voltage display portion 21 still displays the sample voltage Vs, the update mark display portion 22 does not display the update flag, and the battery pattern display portion 23 displays the battery pattern in a blinking manner. (Display aspect A-2).

Similarly, when the update flag stored in the flash memory is 1, indicating that the sampling voltage Vs stored in the flash memory 16 has been updated, if the sampling voltage Vs is greater than the threshold value, the output unit 2 outputs the display state. B. In the display mode B, the sampling voltage display unit 21 initially displays the sampling voltage Vs, the update flag display unit 22 displays the update flag, and the battery pattern display unit 23 displays the battery pattern in a normal (non-flashing) manner (display state). Sample B-1). After a certain period of time, for example, 3 seconds, the update flag is turned off. At this time, the sampling voltage display portion 21 still displays the sampling voltage Vs, the update mark display portion 22 does not display the update flag, and the battery pattern display portion 23 displays the battery pattern in a normal manner. (Display aspect B-2).

When the update flag stored in the flash memory is 0, indicating that the sampling voltage Vs stored in the flash memory 16 has not been updated, if the sampling voltage Vs is less than or equal to the threshold value, the output unit 2 outputs the display state. C. In the display aspect C, the sampling voltage display unit 21 displays the sampling voltage Vs, the update mark display unit 22 does not display the update flag, and the battery pattern display unit 23 displays the battery pattern in a blinking manner to alert the user.

Similarly, when the update flag stored in the flash memory is 0, indicating that the sampling voltage Vs stored in the flash memory 16 has not been updated, if the sampling voltage Vs is greater than the threshold value, the output unit 2 outputs the display mode D. . In the display aspect D, the sampling voltage display unit 21 displays the sampling voltage Vs, the update mark display unit 22 does not display the update flag, and the battery pattern display unit 23 displays the battery pattern in a normal (for example, not blinking) manner.

The above is a display aspect of the low voltage warning according to an embodiment of the present invention. However, the manner of warning is not limited thereto, and a low voltage or a non-low voltage may be displayed in a color distinction, or a warning may be performed in a manner such as a voice reminder.

The technical content and technical features of the present invention have been disclosed as above, and those skilled in the art can still make various substitutions and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should be construed as being limited by the scope of the appended claims

1. . . MCU (micro processing unit)

2. . . Output department

3. . . Secondary battery

4. . . Voltage dividing circuit

5. . . load

6. . . Reset button

11. . . Voltage sampling circuit

12. . . Voltage comparator

13. . . A/D converter (analog/digital converter)

14. . . Busbar

15. . . ALU (arithmetic logic unit)

16. . . Flash memory

twenty one. . . Sampling voltage display

twenty two. . . Update mark display

twenty three. . . Battery pattern display unit

Vs. . . Sampling voltage

Vth. . . Threshold voltage

Fig. 1 is a graph showing changes in the voltage of a secondary battery of a vehicle.

2 is a block diagram showing a low voltage warning device for a secondary battery according to an embodiment of the present invention.

3A is a schematic view showing a low voltage warning device for a secondary battery according to an embodiment of the present invention.

Figure 3B is a partial enlarged view of the dashboard of the vehicle of Figure 3A.

Fig. 3C is an enlarged view of the output portion of Fig. 3B.

Figure 3D is an enlarged view of the reset button of Figure 3A.

4 is a flow chart showing a low voltage warning method for a secondary battery according to an embodiment of the present invention.

Figure 5 is a diagram showing the output of a low voltage warning device in accordance with an embodiment of the present invention.

6 is a schematic diagram showing various display aspects of a low voltage warning device in accordance with an embodiment of the present invention.

(no component symbol description)

Claims (22)

A low voltage warning method for a secondary battery for a vehicle, comprising: a voltage detecting step of a specific time required for the voltage of the secondary battery to reach a substantially safe timing after the vehicle stops charging the secondary battery Afterwards, detecting the voltage of the secondary battery; storing the voltage, after detecting the voltage of the secondary battery, storing the detected voltage as a sampling voltage; comparing the determining step, comparing the sampling a voltage and a predetermined threshold voltage, and determining whether the sampling voltage is less than or equal to the predetermined threshold voltage; and an outputting step of determining, in the comparing determining step, that the sampling voltage is less than or equal to the predetermined threshold voltage When the alarm is output. The low voltage warning method of claim 1, wherein: the vehicle stops charging the secondary battery by closing the main switch of the vehicle; the comparison determining step is performed when the main switch of the vehicle is turned on. And judging, and stopping detecting the voltage of the secondary battery. The low voltage warning method of claim 1, wherein: the specific time required for the secondary battery to reach stability is from the stop of charging the secondary battery until the voltage change rate of the secondary battery is greater than or equal to -0.001 V/ The time until min. The low voltage warning method of claim 1, wherein: the specific time required for the secondary battery to reach stability is approximately one hour. The low voltage warning method of any one of claims 1 to 4, wherein the voltage detecting step is to continuously detect the secondary battery at a predetermined periodic interval after detecting the voltage of the secondary battery. This voltage. The low voltage warning method of claim 5, wherein: the predetermined period interval is 30 minutes. The low voltage warning method of claim 5, wherein the storing step is to update the sampling voltage to the newly detected voltage every time the voltage of the secondary battery is detected. The low voltage warning method of any one of claims 1 to 4, wherein: the outputting step displays a warning in a portion of the original display current time, and switches back to display the current time after the predetermined time of displaying the warning. The low voltage warning method of claim 5, wherein: the output step displays a warning in a portion of the original display current time, and switches back to display the current time after the predetermined time of displaying the warning. The low voltage warning method of claim 6, wherein: the output step displays a warning in a portion of the original display current time, and switches back to display the current time after the predetermined time of displaying the warning. The low voltage warning method of claim 7, wherein: the output step displays a warning in a portion of the original display current time, and switches back to display the current time after the predetermined time of displaying the warning. A low voltage warning device for a secondary battery for a vehicle, comprising: a voltage detecting portion for a specific time required for the voltage of the secondary battery to reach a substantially safe timing after the vehicle stops charging the secondary battery After that, the voltage of the secondary battery is detected; the storage unit stores the voltage of the secondary battery detected by the voltage detecting unit, and uses the voltage as a sampling voltage; the comparison determining unit compares and stores And the sampling voltage and the predetermined threshold voltage in the storage portion, and determining whether the sampling voltage is less than or equal to the predetermined threshold voltage; and the output portion, when the comparison determining portion determines that the sampling voltage is less than or equal to the A warning is output when the threshold voltage is predetermined. The low voltage warning device of claim 12, wherein: the vehicle stops charging the secondary battery by closing the main switch of the vehicle; the comparison determining unit performs the comparison when the main switch of the vehicle is turned on And determining and stopping detecting the voltage of the secondary battery. The low voltage warning device of claim 12, wherein: the specific time required for the secondary battery to reach stability is from the stop of charging the secondary battery until the voltage change rate of the secondary battery is greater than or equal to -0.001 V/ The time until min. The low voltage warning device of claim 12, wherein: the specific time required for the secondary battery to reach stability is approximately one hour. The low voltage warning device of any one of claims 12 to 15, wherein the voltage detecting unit continuously detects the secondary battery at a predetermined periodic interval after detecting the voltage of the secondary battery. This voltage. The low voltage warning device of claim 16, wherein: the predetermined periodic interval is 30 minutes. The low voltage warning device of claim 16, wherein the sampling voltage stored in the storage portion is updated to the newly detected voltage every time the voltage of the secondary battery is detected. The low voltage warning device of any one of claims 12 to 15, wherein: the output portion displays an alert in a portion of the original display current time, and switches back to display the current time after the predetermined time of displaying the alert. The low voltage warning device of claim 16, wherein: the output portion displays an alert in a portion of the original display current time, and switches back to display the current time after the predetermined time for displaying the alert. The low voltage warning device of claim 17, wherein: the output unit displays an alert in a portion of the original display current time, and switches back to display the current time after the predetermined time of displaying the alert. The low voltage warning device of claim 18, wherein: the output unit displays an alert in a portion of the original display current time, and switches back to display the current time after the predetermined time of displaying the alert.