JPH07111736A - Charger of battery for electric motor vehicle - Google Patents

Abstract

PURPOSE:To call an attention by comparing set data before last time of a timer with that of previous time, and generating an alarm when they are different. CONSTITUTION:When a battery 11 of an electric motor vehicle is charged, an operator connects an external power source 6 to a charger 1, and pushes a power ON/OFF button of a control unit 13 provided in the vehicle. Then, a CPU 15 senses an input from the button, and displays a set time of previous time stored in a memory 17 on a display unit 19. In this case, a comparator 18 compares set data before last time stored in the memory 17 with set data of previous time, and the CPU 15 generates an alarm by warming means 22 such as a buzzer, etc., when they are different, and displays that the set data before the last time with that of the previous time on the unit 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery charger for an electric vehicle, for an electric vehicle capable of increasing nighttime charging just before traveling to raise the battery liquid temperature and extend one mileage in winter. The present invention relates to a battery charger.

[0002]

2. Description of the Related Art Electric vehicles generally have a short mileage per charge, and particularly in winter, the battery capacity decreases due to a decrease in the liquid temperature of the battery. Then, the capacity has no margin, and the deep discharge is repeated to shorten the life of the battery.

It is known that in order to improve the performance of the battery in the winter, the liquid temperature of the battery may be raised. So, as a method to raise the battery liquid temperature,
A method of heating by attaching an electric heater to the side surface of the battery or generating an electric current to generate Joule heat is conceivable, but these have problems in practicality, durability, and cost.

Therefore, a battery charger for an electric vehicle has been proposed, which is capable of increasing the battery liquid temperature and extending the one-charge traveling distance in winter by completing the charging at night just before traveling.

FIG. 3 is a circuit diagram showing a conventional battery charger for an electric vehicle disclosed in Japanese Utility Model Laid-Open No. 55-4691.

In FIG. 3, the power supply terminals 2, 3 of the charger 1 are shown.
Is connected to the power supply 6 via the output contact 5 of the timer 4
It is connected to the. The timer 4 is for setting the charging completion time, and the output contact 5 is closed at the start of the time limit and opened when the time limit is completed and the set time comes. Furthermore, the timer 4 is connected to the power supply 6 via the output contact 8 of the second timer 7 which is connected in parallel to the power supply 6. Output contacts 9 and 10 of charger 1
A battery 11 is connected to the.

Next, the operation will be described.

A timer 4 for charging the battery 11
Then, the second timer 7 sets the time limit start time of the timer 4. In this case, charging time is 10
Time, if the start time of using the electric car is 8:00 in the morning,
The time limit of the timer 4 is set to 10 hours, and the time when the second timer 7 is activated to close the output contact 8, that is, the charging start time is set to 10:00 of the previous night.

With this setting, the battery temperature of the battery 11 is high at 8 am when the electric vehicle starts to run, so that the battery 11 is in a high temperature state, and the battery 11 is sufficiently discharged even in winter. It is ready to go.

However, when the electric vehicle is used for work such as delivery, the starting time of use of the electric vehicle is almost the same every day, so that it has a memory function for storing the setting data when the timer was set last time. The applicant has devised a battery charger for an electric vehicle. As a result, it is possible to use the previous setting data as it is and omit the trouble of setting the daily time limit setting (charging time) and the charging start time.

[0011]

However, in the battery charger for the electric vehicle battery having the memory function described above, if there is a habit of charging the battery as it is without changing the setting, it is likely to occur on the next day such as a holiday. In addition, when the setting data of the previous day was different from usual, it is easy to forget to change the setting accidentally, and I charged it with the data of the previous day, and when I tried to use the electric car, the battery charge There is a risk that the battery may be insufficient or not charged at all.

The present invention has been made in order to solve the above problems, and compares the setting data of the timer two times before and the setting data of the previous time, and if they are different, issues a warning and calls attention. It is an object of the present invention to provide a battery charger for an electric vehicle that is capable of charging.

[0013]

The present invention has been made in view of the above circumstances, and a battery charger for an electric vehicle according to the present invention has a timer for setting a charging completion time of the battery and timer setting data. Storing means for storing, the comparing means for comparing the setting data of the previous time and the setting data of the previous time stored in the storing means, and the setting data of the time before the setting and the setting data of the previous time which the comparing means compares when setting the timer. And warning means for issuing a warning when the values are different from each other.

[0014]

According to the above structure, the battery charging device for an electric vehicle according to the present invention stores the setting data of the timer in the storage means, and compares the setting data of the previous time and the previous setting data stored in the storage means by the comparison means. When comparing and setting the charging completion time of the battery in the timer, the warning means issues a warning when the setting data before the comparison by the comparing means is different from the previous setting data.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 (a) is a block diagram showing a battery charger for an electric vehicle according to an embodiment of the present invention, and FIG. 1 (b) is for an electric vehicle shown in FIG. 1 (a). It is a block diagram which shows the operating part of the battery charging device.

This battery charger for an electric vehicle has a charger 1 for charging a battery 11 from an external power source 6, and the charger 1 checks the system such as the state of the battery 11 and the voltage of the power source. The charging controller 12 for performing the above is connected. The operation unit 13 is connected to the charge controller 12.

The operation unit 13 has an input / output unit 14 connected to the charge controller 12. This input / output unit 14
A CPU 15 that controls each unit is connected to. C
The PU 15 stores a timer 16 for setting the charging completion time of the battery 11, a memory 17 as a storage unit for storing the setting data of the timer 16, and the setting data of the last two times and the setting data of the previous time stored in the memory 17. It has a built-in comparator 18 as a comparison means for comparison. The CPU 15 is provided with a setting switch 20 for inputting the next battery usage time and the like, and for switching the mode of the CPU 15, for example, a state of inputting a set time or a time measurement state for starting charging. Mode switch 21, a display 19 for displaying the contents of signals sent to the CPU 15 by the setting switch 20 and the mode switch 21, and when setting the timer,
Warning means 2 for issuing a warning when the setting data before the comparison by the comparator 18 is different from the previous setting data.
2 and are connected.

Next, the charging device in this embodiment will be described with reference to the flow chart of FIG.

When charging the battery 11 of the electric vehicle, the operator connects the external power source 6 to the charger 1 and presses the power on / off button (not shown) of the operation unit 13 provided in the vehicle to display a display signal. input. (Step S1). Then, the CPU 15 detects the input from the power on / off button and displays the previous set time stored in the memory 17 on the display 19 (step S2). At this time, the comparator 18 compares the previous setting data stored in the memory 17 with the previous setting data (step S
3) When the setting data of the last time before and the setting data of the previous time are different, the CPU 15 causes the warning means 22 such as a buzzer.
A warning is issued, and the fact that the setting data of the previous time and the setting data of the previous time are different is displayed on the display 19 (step 4). When the setting data of the last time and the setting data of the last time are the same, the CPU 15 does not perform a special operation.

When it is detected that the power-on / off button is turned on, the CPU 15 sends an activation signal to the charging controller 12 via the input / output unit 14. Then, the charge controller 12 is activated, and after checking the system (installation of the connector, the state of the charger, the voltage of the power supply, etc.), a signal indicating whether or not it is normal is returned. The CPU 15 that has received this reply signal turns on a normal lamp or an abnormal lamp (not shown). If the reply signal is a signal indicating an abnormality, the CPU 15 will not accept the input of any switch other than the power on / off button.

On the other hand, when the reply signal is a signal indicating normality, the input of the set time is accepted and displayed (step S5). For example, assuming that it is set at 8 o'clock, when the increase / decrease button of the setting switch 20 is pushed with respect to the current time (for example, 7 o'clock), the CPU 15 reads the time and adds the increment to the display 19 Is displayed (step S5). The display is 7:00 ... 7:
It changes like 30 ... 8:00. Furthermore, CPU15
Sets the previous setting data stored in the memory 17 as the data before the previous one, and sets the present setting data as the previous data (step S6). When the operator presses a start button (not shown), the CPU 15 receives the signal and starts measuring time (step S7).

The CPU 15 sends a stop signal to the charge controller 12 until the charge start time comes,
The charge controller 12 stops its function and is in a standby state. Then, the CPU 15 calculates a time backward from the set time by a time required for charging, that is, a time at which charging should be started, and sets it in the timer 16. Here, about 8 hours is suitable as the time required for charging. Then, the time is measured until the charging start time comes, and the display of the display 19 is changed accordingly.

When it is time to start charging (step S8), the CPU 15 sends a start signal to the charge controller 12, and the charge controller 12 that receives this start signal starts. Further, the CPU 15 transmits a start signal (step S9), and the charge controller 12 having received the start signal first completely discharges the battery 11, and then starts charging the battery 11 by the charger 1. The battery 11 is completely discharged to prevent the capacity of the battery 11 from decreasing.

At this time, the CPU 15 calculates the optimum charging current and voltage from the voltage, current, temperature, and accumulated charging time of the battery 11, and controls the charger 1 via the charging controller 12 until the charging completion time. The charging controller 12 outputs a signal in accordance with a state such as charging, completion of charging, abnormal charging, etc., and the CPU 15 turns on a lamp corresponding to the state or displays it on the display unit 19.

If the confirmation data (not shown) is turned on (step S10) when the previous setting data and the setting data of the previous time are different in step S4, the operations of step S6 and subsequent steps are performed. If the confirmation switch is not turned on, the operation after step S5 is performed.

[0027]

As described above, according to the present invention, the setting data of the timer is stored by the storage means, and the setting data of the last time and the previous setting data stored in the storage means are compared by the comparing means, When setting the charge completion time of the battery to the timer, it is configured to issue a warning by the warning means when the setting data before the comparison by the comparison means is different from the previous setting data, so it is possible to set a warning on the day before on a holiday etc. If the setting data is different from usual,
By not forgetting to change the setting, it is possible to prevent the battery from being insufficiently charged or not being used at all when the electric vehicle is used.

[Brief description of drawings]

FIG. 1 (a) is a block diagram showing a battery charger for an electric vehicle according to the present invention, and FIG. 1 (b) is a block diagram showing an operating portion of a battery charger for an electric vehicle according to the present invention. Is.

FIG. 2 is a flowchart showing the operation of the present invention.

FIG. 3 is a circuit diagram showing a conventional battery charger for an electric vehicle.

[Explanation of symbols]

 1 Charger 11 Battery 12 Charge Controller 13 Operation Section 14 Input / Output Section 15 CPU 16 Timer 17 Memory 18 Comparator 19 Display 20 Setting Switch 21 Mode Switch 22 Warning Means

Claims (1)

[Claims] 1. A charging device for an electric vehicle battery, comprising a timer for setting a charging completion time of a battery, storage means for storing timer setting data, and setting data before last and setting data previously stored in the storage means. And an alarming means for issuing a warning when the setting data before comparison and the previous setting data compared by the comparing means are different when the timer is set. Car battery charger.