JP2005028951A - Power supply device and vehicle having power supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent exhaustion of a battery. <P>SOLUTION: The power supply device 1 supplies electric power from a power generator 12 to a plurality of loads 5, 6 and 7 via the battery 2. The power supply device 1 comprises switches 3 and 4 opened between the battery 2 and the loads 6 and 7, a stop detecting means 1c for detecting that a charging operation to the battery 2 from the generator 12 stops, a battery residual amount detecting means 1a for detecting residual amount of the battery 2 at a stop time of the charging operation, a range determining means 1e for determining a range including the battery residual amount at a stop time of a power generation operation for a plurality of ranges into which the maximum capacity of the battery 2 is divided in the level direction, and a first power supply stopping means for opening a switch other than the switch connected to the load corresponding to the range including the battery residual amount. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power supply apparatus that supplies power from a generator to a plurality of loads via a battery.
[0002]
[Prior art]
In many electrical components mounted on a vehicle, electric power is consumed for memory retention for maintaining information even when the electrical components are not operating. The power consumption of the battery due to the load current flowing at this time becomes a problem because it accelerates the battery rising when the battery is not charged due to engine stop or the like.
[0003]
For this reason, as a device for preventing the battery from rising due to the load current when the engine is stopped, the battery voltage detecting means for detecting the battery voltage and the first threshold voltage storage for storing the voltage value corresponding to the first remaining battery capacity Means, second threshold voltage storage means for storing a voltage value corresponding to a battery remaining capacity smaller than the first battery remaining capacity, use state detection means for detecting the use state of the vehicle, and engine stop When the engine stop is detected by the engine stop detection means and the engine stop detection means, the first or second state is determined according to the use state of the vehicle detected by the use state detection means. The threshold voltage is read from the threshold voltage storage means, the threshold voltage, The voltage comparison means for comparing the battery voltage detected by the battery voltage detection means and the power supply line opening / closing means are controlled when the voltage comparison means determines that the battery voltage is equal to or lower than the threshold voltage. In addition, a battery rise prevention device (for example, Patent Document 1) including a power supply stop unit that stops supplying power to all the various loads has been proposed.
[0004]
In the above prior art, when engine stop is detected by the engine stop detection means, the threshold voltage stored in the threshold storage means is read according to the use state of the vehicle, and the battery voltage from the battery voltage detection means is When the threshold voltage is compared by the voltage comparison means and it is determined that the battery voltage is equal to or lower than the threshold voltage, the power supply stop means controls the power line opening / closing means, and the power supply for the less important load Is stopped.
[0005]
The prior art shown in Patent Document 1 will be described using the graph shown in FIG. The graph shown in FIG. 8A shows the change in the remaining battery capacity with respect to the time after the engine stops, and the remaining battery capacity (voltage) D1 indicates the minimum remaining battery capacity for maintaining the function of the load. Moreover, the graph of FIG.8 (b) is a change of the load current with respect to the time after an engine stop, and changes with the load connected to a battery.
[0006]
In FIG. 3, a threshold remaining capacity D2 is a threshold remaining capacity (voltage), and this value is set in advance when the vehicle is manufactured. Lines 81, 82, and 83 are three examples with different battery remaining capacities when the engine is stopped, corresponding to the graphs (b-1), (b-2), and (b-3), respectively. Yes. The slopes of the lines before and after the threshold remaining capacity C2 are the same in the above examples. Therefore, these lines are uniquely determined by the remaining battery capacity when the engine is stopped, and the period until the battery runs out is determined by the remaining battery capacity when the engine is stopped. For example, in the line 81, the remaining battery capacity when the engine is stopped is 100%, and power is supplied to all loads until time T1 when the threshold remaining capacity D2 is reached, and thereafter, only the loads with high importance are supplied. In this case, the battery remaining capacity reaches the battery remaining capacity D1 at time T2.
[0007]
[Patent Document 1]
JP-A-11-334498
[0008]
[Problems to be solved by the invention]
In the above prior art, the period from when the engine is stopped until the power supply is finally stopped is determined by the magnitude of the battery voltage at the time of stopping the engine, and the vehicle is used again in a short period of time. Since it is based on the premise, even if it is known in advance that the vehicle will not be used for a long period of time, battery power will be avoided by supplying power even to less important loads in the initial stage after engine shutdown could not.
[0009]
The present invention has been made to solve the above-mentioned problems, and by continuing the operation of only necessary electrical components according to the remaining battery capacity, it is possible to reduce the convenience and minimize the engine re-operation. The purpose is to ensure startability.
[0010]
[Means for Solving the Problems]
A power supply device according to claim 1 is a power supply device that supplies power to a plurality of loads from a power generator via a battery, the switch opened between the battery and the load, and Stop detection means for detecting that the charging operation from the generator to the battery has stopped, battery remaining capacity detection means for detecting the remaining capacity of the battery when the charging operation is stopped, and a plurality of the maximum capacity of the battery in the level direction For each range divided into ranges, the range determination means for determining a range including the remaining battery capacity when the power generation operation is stopped, and a load associated with the range including the remaining battery capacity And a first power supply stopping means for opening a switch other than the opened switch.
[0011]
According to this configuration, the divided range including the remaining battery capacity is determined by the range determining unit, and the load associated with the range including the remaining battery capacity is determined by the first power supply stopping unit. Since the switches other than the connected switch are opened, the power supply is continued (maintained) for each load classification according to the remaining battery capacity when charging to the battery is stopped, and according to the remaining battery capacity. By controlling the power supply, the remaining capacity of the battery is reduced as much as possible regardless of the remaining capacity of the battery when the generator is stopped.
[0012]
In the power supply device according to claim 2, in the configuration described above, priority is set for the load corresponding to each of the ranges, and switches other than the corresponding switch are opened according to the priority. To do. According to this configuration, since the classification is performed according to the priority of the load, the supply of power to the load with a high priority is preferentially continued.
[0013]
According to a third aspect of the present invention, in the above configuration, the power supply device includes a threshold setting unit that sets a threshold for dividing the range, and a comparison unit that compares the remaining battery capacity with the threshold. According to this configuration, the range is automatically determined when the charging is stopped.
[0014]
According to a fourth aspect of the present invention, in addition to the above-described configuration, the power supply device further includes a schedule setting unit that receives an input from the outside and sets a suspension period of the load device, and the threshold setting unit corresponds to the suspension period. To set the threshold. According to this configuration, since the threshold value is set by the threshold value setting unit in accordance with the set idle period of the load device, the battery does not run out for the period when the idle period of the load device is known in advance. Thus, the supply of power can be controlled.
[0015]
In the power supply device according to claim 5, in the above configuration, the range is set to three or more. According to this configuration, it is desirable to maintain power supply for as long as possible at least as important as security, etc., and to maintain power supply for as long as possible if not possible, such as an air conditioner, It is convenient if the power supply of the remote control mirror or the like is maintained, but it can be divided into those that do not cause a significant problem if not maintained, and it is possible to maintain the power supply to a load that meets the requirements of the user.
[0016]
In addition to the above configuration, the power supply device according to claim 6 further includes a time lapse measuring means for measuring an elapsed time after stopping the charging operation, and all loads excluding a predetermined number of loads from a higher priority. A power saving transition period setting means for setting a power saving transition period until the power supply to the low priority load group is stopped, and the low priority load when the elapsed time coincides with the power saving transition period. Second power supply stopping means for stopping power supply to the group. According to this configuration, since it is possible to set a time to start saving power, power can be supplied to a larger number of loads before the time period, and power can be supplied only to a load having the highest priority after the time period. While controlling the power supply so that the battery does not run out for a specified period, it is possible to maintain a larger load before the above period.
[0017]
In addition to the above configuration, the power supply device according to claim 7 further includes notification means for notifying the outside that the remaining battery capacity is equal to or less than a predetermined remaining capacity. According to this configuration, since the notification unit is provided, it is possible to notify the user that the battery will run out in the near future before the battery runs out.
[0018]
According to an eighth aspect of the present invention, there is provided the power supply apparatus according to the above-described configuration, wherein the battery is mounted on a vehicle, the load is disposed on a vehicle, and the charge stop detection means has an ignition key as an operation instruction for a generator. The charging stop is detected by detecting the return from the position to the key insertion position. According to this configuration, since it is determined that charging has been stopped based on the position of the ignition key, it is possible to easily determine whether charging has stopped.
[0019]
According to a ninth aspect of the present invention, in the above configuration, the remaining battery capacity detecting unit detects the remaining battery capacity from the output voltage of the battery. According to this configuration, since the remaining battery capacity is detected by the battery voltage, the remaining battery capacity can be easily detected.
[0020]
A vehicle equipped with the power supply device according to claim 10 is a vehicle equipped with a power generator and a battery that is charged by the power generator and consumes the charged power when the engine is stopped, and is equipped with the power supply device described above. According to this configuration, since the power supply device is mounted on the vehicle, there is an effect that the remaining capacity of the battery is reduced as much as possible regardless of the remaining capacity of the battery when the generator is stopped. The vehicle can be provided to the user.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram schematically showing a functional configuration of a power supply apparatus 1 according to an embodiment of the present invention and a concept of a system related to the power supply apparatus 1. This power supply device 1 is connected to a battery 2 that is charged by a generator 12 that generates power proportional to the number of revolutions of the engine and to loads 5, 6, and 7 such as electrical components provided in a vehicle or the like. The power supply from the battery 2 to the loads 5, 6, and 7 is controlled.
[0022]
As shown in the chart of FIG. 2, the load is divided into a predetermined number, for example, three groups according to the importance (priority). The load 5 in FIG. 1 is a group A that wants to maintain power supply for a long time, and is shown in the row 21 in the diagram of FIG. Examples of Group A loads include an intrusion sensor, a security horn, security, an immobilizer, and EFI (Electric Fuel Injection). The load 6 in FIG. 2 is a group B in which power supply is desired to be maintained for a long time in accordance with the group A, and is shown in the row 22 in the chart of FIG. Examples of Group B loads include air conditioners, TEL, and anti-lock brake systems. The load 7 is a group C having a low importance of maintaining power supply and is shown in the row 23 in the diagram of FIG. Examples of the load of the group C include an ETC (Electronic Toll Collection System), a back monitor, and a remote control mirror.
[0023]
Below, each function part of the said electric power feeder 1 is demonstrated.
[0024]
Relays 3 and 4 are provided on the wiring from the battery 2 to the loads 6 and 7, respectively, as an example of a switch, and perform switching for power supply in response to an open / close instruction from the first power supply stop unit 1d. The load 5 is directly connected to the battery 2 in order to maintain long-term power supply.
[0025]
The battery remaining capacity detection unit 1 a detects the remaining capacity of the battery 2 by measuring the voltage of the battery 2. The use schedule setting unit 1b acquires the next scheduled use date of the vehicle input by the user using the interface panel 8 attached to the vehicle, and compares the current date and time with the end of the next scheduled use date from the current date and time. The rest period of the vehicle, which is the period up to the time, is calculated.
[0026]
In a vehicle in which the engine is started and stopped according to the rotation position of the ignition key, and the stop of the engine and the charging stop of the battery are interlocked, the charging stop detection unit 1c obtains the ignition key position information from the ignition key cylinder 9 When the ignition key is returned from the operation instruction position of the generator 12 to the key insertion position, the charging stop is detected as the charging is stopped.
[0027]
The classification unit 1g holds the importance of each load shown in FIG. 2 as a classification information table. The table is stored in storage means such as a ROM or RAM.
[0028]
The threshold value setting unit 11e acquires the suspension period of the vehicle from the scheduled use setting unit 1b, acquires a list of loads belonging to the respective importance groups and information on their load currents from the classification unit 1g, A power consumption rate representing a load current per unit time when power is supplied to the loads 5, 6, 7 is calculated, and the remaining battery capacity is calculated at the end of the vehicle rest period at the power consumption rate when power is supplied to all loads. The remaining battery capacity at the time of stopping charging at which the minimum remaining capacity that can be restarted is set as the first threshold value. Similarly, the remaining power of the battery when charging is stopped when calculated with the power consumption rate when power is supplied to the loads of the groups A and B is the second threshold, the power consumption rate when power is supplied only to the load of the group A The remaining battery capacity when calculated in step 3 is set as the third threshold value. In the threshold setting unit 11e, a threshold other than the above can be set and used other than the power supply control. For example, in the present embodiment, a threshold value for detecting that the battery is almost exhausted is provided and used for warning to the outside.
[0029]
When the range determination unit 1e receives a signal notifying that the charging has stopped from the charging stop detection unit 1c, the range determination unit 1e compares the threshold value with the remaining battery capacity acquired from the remaining battery capacity detection unit, and the threshold value including the remaining battery capacity is included. Determine the range. According to this range, the first power supply stop unit 1d finally determines which load is to be fed. For example, if the remaining battery capacity is equal to or greater than the first threshold, power is supplied to the entire load. If the remaining battery capacity is less than the first threshold and greater than or equal to the second threshold, power supply to the group C load is stopped. If the remaining battery capacity is equal to or less than the second threshold, power supply to the loads of the groups B and C is stopped. The range of the determination result is transmitted to the first power supply stop unit 1d and the notification unit 1f.
[0030]
The first power supply stop unit 1d acquires the range as the determination result from the range determination unit 1e, acquires the load classification information from the classification unit 1g, determines the load to stop the power supply, the corresponding relay 3 and The power supply to the load is stopped by opening control 4.
[0031]
The notification unit 1f acquires a range that is a determination result from the range determination unit 1e. For example, if the range is equal to or less than the third threshold, the remaining battery capacity is obtained using the speaker 10 or the lamp 11 installed in the vehicle. Informs the outside that there is little remaining.
[0032]
The power control operation will be described below based on the flowchart shown in FIG.
[0033]
First, in S10, when a scheduled date for the next use of the vehicle is input from the user interface such as the interface panel 8 installed in the vehicle by the user, in S10, the scheduled next use date is input to the scheduled use setting unit 1b. Entered. In the use schedule setting unit 1b, the scheduled use date is compared with the current date and time, and the time from the current date and time to the final time of the scheduled use date is obtained and held as a suspension period of the vehicle.
[0034]
In S12, the rotation position of the ignition key of the vehicle is detected by the charge stop detection unit 1c. That is, the position of the key is analyzed by the charge stop detection unit 1c, and it is determined whether or not the engine is stopped, that is, whether or not charging is being performed, to determine whether or not the charge is stopped. If it is determined that the battery is in the charged state (NO in S12), the charged state is always checked thereafter. If it is determined that the charging is stopped (YES in S12), the threshold remaining capacity is calculated as the threshold value (S14).
[0035]
In S14, the threshold setting unit 11e sets three types of threshold remaining capacities C2, C3, and C4 for dividing the maximum capacity of the battery into four for the above three types of load importance and battery warning. The Here, if the remaining battery capacity is less than the threshold remaining capacity C2, the battery warning is output. If the remaining battery capacity C2 is less than or equal to the remaining threshold capacity C3, power is supplied only to the load 5, and the threshold is exceeded. If the remaining capacity is C3 or more and less than the threshold remaining capacity C4, power is supplied to the loads 5 and 6, and if it is more than the threshold remaining capacity C4, power is supplied to all loads. Further, the minimum battery remaining capacity capable of maintaining the load function is stored in advance in the power supply apparatus as C1 of the battery remaining capacity.
[0036]
When the threshold remaining capacity is the threshold remaining capacity C2, when the charging is stopped such that the remaining battery capacity becomes the remaining battery capacity C1 at the end of the vehicle suspension period at the power consumption rate when power is supplied to the full load. Is calculated as the remaining battery capacity. Similarly, the threshold remaining capacity C3 is supplied only to the load of the group A and the remaining battery capacity at the time of charging calculated by the power consumption rate when the load is supplied to the loads of the groups A and B. It is calculated as the remaining battery capacity at the time of charging stop calculated by the above power consumption rate.
[0037]
In S16, the remaining capacity of the battery 2 is detected by the remaining battery capacity detection unit 1a.
[0038]
In S18, the range determination unit 1e reads the threshold remaining capacity from the threshold setting unit 11e and the remaining battery capacity from the battery remaining capacity detection unit 1a. First, the remaining battery capacity is read from the threshold remaining capacity. It is determined whether the capacity is greater than or equal to C2. If the remaining battery capacity is less than the threshold remaining capacity C2 (NO in S18), it is determined in S20 that the remaining battery capacity is low by the notification unit 1f, such as the speaker 10 installed in the vehicle and / or a warning light. The user is notified by the lamp 11 display.
[0039]
In S22, the range determination unit 1e instructs the first power supply stop unit 1d to switch the relays 3 and 4 to the open state. Accordingly, the relays 3 and 4 are opened by the first power supply stop unit 1d, and power supply to the loads 6 and 7 is cut off.
[0040]
In S18, if the remaining battery capacity is greater than or equal to threshold remaining capacity C2 (YES in S18), it is determined in S24 whether the remaining battery capacity is greater than or equal to threshold remaining capacity C3.
[0041]
In the branch of S24, if the remaining battery capacity is less than the threshold remaining capacity C3 (NO in S24), the same process as S22 is performed.
[0042]
In S24, if the remaining battery capacity is greater than or equal to threshold remaining capacity C3 (YES in S24), it is determined in S26 whether or not the remaining battery capacity is greater than or equal to threshold remaining capacity C4.
[0043]
In S26, if the remaining battery capacity is less than the threshold remaining capacity C4 (NO in S26), the remaining battery capacity is between C3 and C4. Therefore, in S28, the power is supplied to the loads 5 and 6. An instruction to open the relay 4 is given by the first power supply stop unit 1d. Accordingly, the relay 4 is opened by the first power supply stop unit 1d and the power supply to the load 7 is cut off.
[0044]
In S26, if the remaining battery capacity is equal to or greater than the threshold remaining capacity C4 (YES in S26), the state is maintained as it is.
[0045]
Next, the effect in the first embodiment of the present invention will be clarified using the graph shown in FIG. The graph in FIG. 4A shows the change in the remaining battery capacity with respect to the time after the stop of charging, as in FIG. 8, and the remaining battery capacity C1 indicates the minimum remaining battery capacity for maintaining the load function. ing. Moreover, the graph of FIG.4 (b) shows the change of the load electric current with respect to the time after a charge stop, and changes with the load connected to a battery.
[0046]
Time T3 is the next scheduled use date set by the user, and remaining battery capacities C2, C3, and C4 are threshold remaining capacities. The load to be fed is determined depending on which range of the threshold remaining capacities the remaining battery capacity at the time of charging stop, and the slope of the graph is determined. The discharge current amount is set so that the lines 43, 42, 41 when starting from the threshold remaining capacities C2, C3, C4 intersect the remaining battery capacity C1 at time T3. The lines starting from within the same range have the same slope, and the slope is determined to intersect the remaining battery capacity C1 at the final time of the next scheduled use date when starting from each threshold remaining capacity. In all cases, battery exhaustion before the next scheduled use date is avoided.
[0047]
For example, the line 44 starting from the threshold remaining capacity C4 or more has the same slope as the line 41, and the line 45 starting from between the threshold remaining capacity C3 and the threshold remaining capacity C4 has the same slope as the line 42. A line 46 starting from between the remaining capacity C2 and the threshold remaining capacity C3 has the same slope as the line 43 and intersects the remaining battery capacity C1 after time T3. The line 47 starting from between the threshold remaining capacity C2 and the battery remaining capacity C1 has the same slope as the line 43 and intersects with the battery remaining capacity C1 at time T4. This is because the minimum remaining capacity for preventing the battery from running out until time T3 is the threshold remaining capacity C2, and the remaining battery capacity is less than the threshold remaining capacity C2 when charging is stopped. The graph of the load current with respect to the elapsed days corresponding to each line 44, 45, 46, 47 is shown in (b-1), (b-2), (b-3), (b-4). The load current I1 is a load current when power is supplied to all loads, the load current I2 is a load current when power is supplied to the loads 5 and 6, and a load current I3 is a load current when power is supplied only to the load and the load 5. is there.
[0048]
As described above, according to the first embodiment, the user inputs the next scheduled date of use of the vehicle, and until the next scheduled date of use according to the remaining battery capacity at the time of charging stop and the length of the period until the next scheduled date of use. Chooses to feed loads of multiple importance levels so that the remaining battery capacity can be restarted, so if you know in advance that the vehicle will not be used for a long time It is possible to prevent the battery from running up while maintaining the functions of the electrical components.
[0049]
Next, 2nd embodiment which concerns on this invention is described based on drawing. FIG. 5 is a block diagram schematically showing the functional configuration of the power supply device 1 according to the second embodiment of the present invention and the concept of the system according to the power supply device 1. Compared to the first embodiment, a save timing setting unit 1h, a time lapse measurement unit 1k, and a second power supply stop unit 1i are added to the functional block in the power supply device 1, and a range determination unit 1j and a threshold value are added. The setting unit 11j performs control different from that in the first embodiment. In the present embodiment, the remaining battery capacity is kept at a level at which the engine can be restarted until the next scheduled use date, as in the first embodiment, but in addition to this, after the save timing which is time information specified by the user Power is supplied only to the load 5 having the highest importance, and power is supplied to a larger number of loads in the previous period. In the following, only the differences from the first embodiment will be described. The save timing is information for designating the time when power saving is started (the time when power supply to loads other than the load 5 having the highest importance is stopped). In this embodiment, the period from the charge stop is the number of days. As the user inputs.
[0050]
The save timing setting unit 1h acquires the save timing input by the user using the interface panel 8, and holds the save timing.
[0051]
The time lapse measuring unit 1k starts a timer count from the charging stop time and measures the time lapse from the charging stop time. Further, the save timing is compared with the timer count, and if they match, the following second power supply stop unit 1i is instructed to stop power supply to a group other than the load group having the highest importance.
[0052]
The second power supply stopping unit 1i receives an instruction from the time lapse measuring unit 1k and stops supplying power to other than the load group having the highest importance.
[0053]
Next, with reference to the flowchart shown in FIG. 6, the part of the processing flow that is different from the first embodiment will be described.
[0054]
In S30 and S32, first, the save timing is input by the user using the interface panel 8 or the like together with the next scheduled use date. This is input as the number of days from when the charging is stopped until the power supply to only the load 5 is started. The number of days is input from the interface panel 8 to the save timing setting unit 1h, and the number of days is converted into time by the save timing setting unit 1h and held as a save timing.
[0055]
In S34, after charging is determined as in the first embodiment, if charging is stopped (YES in S34), timer counting is started by the time lapse measuring unit 1k and charging is performed in S36. The elapsed time from the stop is measured.
[0056]
In S38, the threshold remaining capacity is calculated.
[0057]
The threshold remaining capacity calculation method in the present embodiment is different from the calculation method used in the first embodiment. However, the meaning of the range between the threshold remaining capacities C1, C2, C3, and C4 is the same. First, the remaining battery capacity C11 at the save timing at which the remaining battery capacity becomes the remaining battery capacity C1 at the end time of the scheduled use date is calculated at the power consumption rate when power is supplied only to the load 5. After that, the end time of the next scheduled use date and the remaining battery capacity C1 in the first embodiment are replaced with the save timing and the remaining battery capacity C11, respectively, and only the load 5 is obtained in the same manner as in the first embodiment. When the load 5 and the load 6 are connected, the remaining battery capacity when charging is stopped according to the power consumption rates when all loads are connected is the threshold remaining capacity C2, C3, C4.
[0058]
In S40, the remaining battery capacity when charging is stopped is detected by the remaining battery capacity detector 1a.
[0059]
Until the remaining battery capacity is compared with C4 in the following flow, the process is the same as in the first embodiment (S42, S44, S46, S48).
[0060]
In the comparison of S50, when the remaining battery capacity is less than the threshold remaining capacity C4 (NO in S50), in S52, the range determination unit 1j stops the power supply to the load 7 with respect to the second power supply stop unit 1i. The second power supply stop unit 1i closes the relay 4 and stops the power supply to the load 7.
[0061]
In S54, the time lapse measuring unit 1k then repeatedly compares the timer count and the save timing. When the timer count and the save timing are the same (YES in S54), the save timing comes in S56. Therefore, the range determination unit 1j instructs the second power supply stop unit 1i to stop supplying power to the load 6, and the second power supply stop unit 1i closes the relay 3 and stops supplying power to the load 6. The As a result, only the load 5 is fed, and power saving is started.
[0062]
In S50, when the remaining battery capacity is equal to or greater than the threshold remaining capacity C4 (YES in S50), in S58, the time elapsed measurement unit 1k repeatedly compares the timer count and the save timing, and the timer count If the save timing becomes the same (YES in S58), it means that the save timing has come in S60, so the range determination unit 1j stops the power supply to the loads 6 and 7 with respect to the second power supply stop unit 1i. , The relays 3 and 4 are closed by the second power supply stop unit 1i, and power supply to the loads 6 and 7 is stopped. As a result, only the load 5 is fed, and power saving is started.
[0063]
Next, the effect in the second embodiment of the present invention will be clarified using the graph shown in FIG. Similar to FIGS. 4 and 8, the graph of FIG. 7A shows the change in the remaining battery capacity with respect to the time after the charging is stopped, and the remaining battery capacity C1 indicates the minimum remaining battery capacity for maintaining the load function. Show. Moreover, the graph of FIG.7 (b) shows the change of the load current with respect to the time after a charge stop, and changes with the load connected to a battery.
[0064]
Time T5 is the next scheduled use date set by the user, and remaining battery capacities C2, C3, and C4 are threshold remaining capacities. In the present embodiment, the discharge current amount is set so that the lines 73, 72, 71 when starting from the threshold remaining capacities C2, C3, C4 intersect the remaining battery capacity C11 at time T3. The lines started from within the same range have the same slope, and the slope is determined to be the remaining battery capacity C11 at the save timing when starting from each threshold remaining capacity. A battery drain before the next scheduled use date is avoided.
[0065]
For example, the line 75 starting from the threshold remaining capacity C4 or more has the same slope as the line 71, and the line 76 starting from the opening of the threshold remaining capacity C3 and the threshold remaining capacity C4 is the line 72 and the threshold remaining capacity C2. The line 77 starting from between the threshold remaining capacity 3 has the same slope as the line 73 and takes a value equal to or greater than the remaining battery capacity C11 at time T6, and therefore intersects the remaining battery capacity C1 after time T5. The line 78 starting between the threshold remaining capacity C2 and the battery remaining capacity C1 has the same slope as the line 73 and intersects the battery remaining capacity C11 at time T7. This is because the minimum remaining capacity for preventing the battery from running out until time T5 is the threshold remaining capacity C2, and the remaining battery capacity is less than the threshold remaining capacity C2 when charging is stopped. The graph of the load current with respect to the elapsed days corresponding to each line 75, 76, 77, 78 is shown in (b-1), (b-2), (b-3), (b-4). The load current I1 is a load current when power is supplied to all loads, the load current I2 is a load current when power is supplied to the loads 5 and 6, and a load current I3 is a load current when power is supplied only to the load and the load 5. is there.
[0066]
Thus, according to the second embodiment, as in the first embodiment, the remaining battery capacity that allows the engine to be restarted until the next scheduled use date input by the user is ensured, and at the same time after the date specified by the user. By supplying power only to the most important load, power can be supplied to more loads before that day.
[0067]
In the above embodiment, the classification unit 1g is realized as a table as information stored in a ROM or the like. However, the classification unit of the present invention may be configured using a hardware circuit. According to this configuration, a faster classification search can be performed as a process in the power supply apparatus.
[0068]
Moreover, each component of the power supply apparatus in the above embodiment can be realized by either software or hardware. When implemented with software, functions and data can be easily updated, and when implemented with hardware, higher-speed processing is possible.
[0069]
In the above embodiment, the load is classified according to the importance, but the load classification in the present invention may be classified according to the use frequency of the load. Further, the classification may be changed according to the season. Further, the importance of each load may be set by the user. According to these configurations, it is possible to classify and assign importance levels more suitable for the user's request.
[0070]
In the above embodiment, the charge stop is detected by detecting the position of the ignition key, but the charge stop detection means in the present invention directly detects the charge state of the battery from the dynamo or other generator. The charging stop may be detected. According to this configuration, it is possible to detect the charge stop when the charge is stopped due to a cause other than the engine stop, and the vehicle where the engine stop instruction by the ignition key does not exactly match the actual engine stop, or the position of the ignition key Even in a vehicle that starts the engine by means other than the above, the power supply device can be supplied effectively.
[0071]
Moreover, the charge stop detection means in the present invention may detect that the power is detected and that the charging is stopped when a dynamo or other generator that generates power using the power of the engine is in an operation stop state. . According to this configuration, it is possible to accurately detect the charge stop even in a vehicle in which the engine stop by the ignition key and the actual engine stop timing do not exactly coincide.
[0072]
The power supply apparatus of the present invention is not limited to the vehicle-mounted one, but can be applied to a house where power is supplied by a battery using self-power generation.
[0073]
【The invention's effect】
According to the first aspect of the present invention, since the supply of power is determined for each load classification according to the remaining battery capacity when charging to the battery is stopped, the power supply is controlled according to the remaining battery capacity. Power supply can be controlled so that the battery runs out.
[0074]
According to the second aspect of the present invention, since the classification is performed based on the importance of the load, priority can be given to the supply of power to the load having a high importance.
[0075]
According to the invention described in claim 3, since the threshold setting means for determining the range is provided, the range can be determined when the charging is stopped.
[0076]
According to the invention described in claim 4, since it is possible to set a scheduled period until the next use of the vehicle, when it is known in advance that the vehicle cannot be used for a long period of time, the battery does not run out during the period. The power supply can be controlled.
[0077]
According to the fifth aspect of the present invention, it is desirable to maintain the power supply as long as possible for at least the importance of the load, such as security, and to supply the power as long as possible, although not as important as the above-mentioned importance of an air conditioner or the like. It can be divided into what is desired to be maintained and it is convenient if the power supply of the remote control mirror etc. is maintained, but if it is not maintained, it can be divided into those that do not cause a big problem, and it is possible to maintain the power supply to the load more suitable for the user's desire .
[0078]
According to the sixth aspect of the present invention, since it is possible to set the time to start power saving, power can be supplied to more loads before the time and only power with the highest importance can be supplied after the time. In addition, more loads can be maintained before the above time while controlling power feeding so that the battery does not run out for a period specified by the user.
[0079]
According to the seventh aspect of the present invention, since the notification means is provided, it is possible to notify the user that the battery will run out in the near future before the battery runs out.
[0080]
According to the eighth aspect of the invention, since it is determined that charging has been stopped based on the position of the ignition key, it is possible to easily determine whether charging has stopped.
[0081]
According to the ninth aspect of the present invention, since the remaining battery capacity is detected by the battery voltage, the remaining battery capacity can be easily detected.
[0082]
According to the tenth aspect of the present invention, since the power supply device is mounted on a vehicle, a vehicle having the above effects can be provided to the user.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a functional configuration of a system using a power supply device according to a first embodiment of the present invention.
FIG. 2 is a chart showing an example of load and its importance ranking.
FIG. 3 is a diagram showing a flow of processing of the power supply device shown in FIG. 1;
4A is a graph showing a remaining battery capacity with respect to time when the power supply device shown in FIG. 1 is used, and FIG. 4B is a graph showing a load current with respect to time. FIG.
FIG. 5 is a block diagram showing a functional configuration of a system using a power supply device according to a second embodiment of the present invention.
6 is a diagram showing a flow of processing of the power supply device shown in FIG. 5. FIG.
7A is a graph showing a remaining battery capacity with respect to time when the power supply device shown in FIG. 5 is used, and FIG. 7B is a graph showing a load current with respect to time. FIG.
FIG. 8A is a diagram showing a graph representing a remaining battery capacity with respect to time when a power supply device shown in the prior art is used, and FIG. 8B is a diagram showing a graph showing a load current amount with respect to time.
[Explanation of symbols]
1 Power supply device
2 battery
3, 4 Relay (switch)
5, 6, 7 load
1a Battery remaining capacity detection unit (battery remaining capacity detection means)
1b Use schedule setting section (use schedule setting means)
1c Charge stop detection part (stop detection means)
1d 1st power supply stop part (1st power supply stop means)
1e Range determination unit (range determination means)
11e Threshold setting unit (threshold setting means)
1f Notification section (notification means)
1g Classification part (range judgment means)
1k time lapse measuring unit (time lapse measuring means)
1h Save timing setting section (power saving transition period setting means)
1i 2nd power supply stop part (2nd power supply stop means)

Claims (10)

A power supply device that supplies power from a generator to a plurality of loads via a battery,
A switch interposed between the battery and the load;
Stop detection means for detecting that the charging operation from the generator to the battery has stopped,
Battery remaining capacity detecting means for detecting the remaining capacity of the battery when the charging operation is stopped;
Range determining means for determining a range including the remaining battery capacity when the power generation operation is stopped for each range obtained by dividing the maximum capacity of the battery into a plurality of ranges in the level direction;
1. A power supply apparatus comprising: a first power supply stop unit that opens a switch other than the switch connected to a load associated with a range including the remaining battery capacity. . The first power supply stopping means sets a priority for the load corresponding to each of the ranges, and opens a switch other than the corresponding switch according to the priority. The power supply apparatus according to claim 1. The range determination unit includes a threshold setting unit configured to set a threshold for dividing the range, and a comparison unit configured to compare the remaining battery capacity with the threshold. Power supply equipment. 4. The apparatus according to claim 1, further comprising a schedule setting unit that accepts an input from the outside and sets a suspension period of the load device, and the threshold setting unit sets a threshold according to the suspension period. A power supply device according to claim 1. The power supply apparatus according to claim 1, wherein the range is set to three or more. A time lapse measuring means for measuring an elapsed time after stopping the charging operation,
A power saving transition period setting means for setting a power saving transition period until the power supply to the low priority load group, which is all loads excluding a predetermined number of loads from the higher priority, is stopped;
6. A second power supply stopping unit that stops power supply to the low priority load group when the elapsed time coincides with the power saving transition period. A power supply device according to any one of the above. 2. The range determining unit includes a notifying unit that determines whether or not the remaining battery capacity is equal to or less than a predetermined remaining capacity and notifies the outside that the remaining battery capacity is equal to or less than the predetermined remaining capacity. The power supply apparatus in any one of -6. The battery is for in-vehicle use, the load is disposed on the vehicle, and the charge stop detection means detects that the ignition key is returned from the operation instruction position of the generator to the key insertion position. The power supply device according to any one of claims 1 to 7, wherein charging stop is detected. The power supply apparatus according to any one of claims 1 to 8, wherein the remaining battery capacity detecting means detects a remaining battery capacity from an output voltage of the battery. A vehicle equipped with a power generator and a battery that is charged by the power generator and consumes charging power when the engine is stopped, wherein the vehicle is equipped with the power supply device according to claim 1. .

Images