JP2005318730A - Power controller for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress an excessive load operation change when the state of a battery abruptly changes, concerning a power controller for a vehicle. <P>SOLUTION: This power controller is provided with a load control level of three or more stages which show the degrees of priority related to power supply from a battery to each of a plurality of pieces of electric loads mounted on a vehicle. A request level to be set to perform the power supply from the battery is set based on the capacity of the battery or a voltage between terminals. Then, an actual load control level to perform the power supply from the battery is switched stage by stage in order at every specified time from a current level to the requested level. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle power supply control device, and more particularly to a vehicle power supply control device that is suitable for controlling power supply from a battery to a plurality of in-vehicle electric loads.

2. Description of the Related Art Conventionally, there is known a vehicular power supply control device that includes a battery that stores electric power and a plurality of in-vehicle electric loads that are driven when electric power is supplied from the battery, and controls power supply from the battery to the in-vehicle electric load. (For example, refer to Patent Document 1). In this apparatus, the capacity (SOC) of the battery is calculated, and it is determined whether or not the SOC is larger than a predetermined threshold value. As a result, when the SOC is equal to or lower than a predetermined threshold value, an electric load that is less important in supplying power from the battery is extracted in order to reduce the total required power of the in-vehicle electric load. The power supply to the load is stopped or the driving rate thereof is reduced. For this reason, according to the above-described conventional apparatus, when the capacity SOC of the battery becomes small, the excessive operation of the electric load is restricted, so that it is possible to suppress the decrease in the capacity of the battery. It is possible to prevent the battery life on the road and the battery running out on the road.
JP 2002-199505 A

  By the way, the capacity of the battery and the voltage between terminals may show a large and sudden change. In the above-described conventional apparatus, when the calculated battery capacity shows a large sudden change, the power supply to the electric load is cut or reduced faithfully along with the sudden change, or the release is performed. Then, when the sudden change is temporary, the control is canceled immediately after the power supply cut or reduction is executed, or immediately after the power supply cut or reduction is released again. Cutting or reduction is performed, and a situation occurs in which the operating state of the electric load changes frequently and excessively.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a vehicle power supply control device capable of suppressing an excessive load operation change when a battery state suddenly changes.

  The above object includes a battery for storing electric power and a plurality of in-vehicle electric loads each driven by power supply from the battery, and supplies power from the battery to each in-vehicle electric load. A vehicle power supply control device for controlling the load, based on load control levels of three or more stages indicating the priority of power supply from the battery to each of the plurality of in-vehicle electric loads, and the capacity of the battery or the voltage between terminals. Request level setting means for setting a required level of the load control level to be realized when power is supplied from the battery, and the load control level when power is supplied from the battery. Level switching means for switching from the control level to the required level set by the required level setting means step by step It is achieved by the vehicle power supply control apparatus comprising a.

  In the first aspect of the present invention, there are provided three or more levels of load control levels indicating the priority of power supply from the battery to each of the plurality of in-vehicle electric loads. Then, the load control level for supplying power from the battery is switched step by step from the current level to a required level set based on the battery capacity or the voltage between terminals. In such a configuration, even when the required level set from the battery capacity or the voltage between the terminals is greatly deviated from the current level, the load control level does not switch to the required level at once in a short time, There is no excessive operational change in the electrical load.

  In this case, as described in claim 2, in the vehicular power supply control device according to claim 1, each time the load control level for supplying power from the battery by the level switching unit is switched step by step, In performing power supply from the battery based on the relationship between the load control level after switching and the required level based on the battery capacity or inter-terminal voltage set by the required level setting means after a predetermined time. If a correction necessity determination means for determining whether or not the load control level needs to be corrected is provided, when the change in the battery capacity or the voltage between the terminals is temporary, the switching of the load control level is originally set. There is no excess over to the required demand level and no excessive operational changes of the electrical load will occur.

  In addition, as described in claim 3, the above object includes a battery for storing electric power, and a plurality of in-vehicle electric loads that are respectively driven by power supply from the battery, and the battery is connected to each in-vehicle electric load. A power supply control device for a vehicle that controls power supply, wherein the load control level includes three or more stages indicating a priority degree of power supply from the battery to each of the plurality of in-vehicle electric loads, and the battery capacity or inter-terminal voltage Based on the request level setting means for setting a request level of the load control level to be realized when power is supplied from the battery, and the request set by the current load control level and the request level setting means When there is an intermediate load control level between the battery level and the power supply from the battery, A vehicle power supply control comprising: a level switching unit that switches a load control level from the current load control level to the intermediate load control level, and then switches from the intermediate load control level to the required level. Achieved by the device.

  In a third aspect of the present invention, there are three or more levels of load control levels indicating the degree of priority related to the power supply from the battery to each of the plurality of in-vehicle electric loads. When an intermediate level exists between the current level and the required level set based on the capacity of the battery or the voltage between terminals, the load control level for supplying power from the battery is first determined from the current level. Switch to the intermediate level, and then switch from the intermediate level to the requested level. In such a configuration, even when the required level set from the battery capacity or the voltage between the terminals is greatly deviated from the current level, the load control level does not switch to the required level at once in a short time. There is no excessive operational change in the load.

  In this case, as described in claim 4, in the vehicle power supply control device according to claim 3, the level switching means supplies power from the battery when there are a plurality of the intermediate load control levels. First, the load control level is switched from the current load control level to a level closer to the request level set by the request level setting means among the plurality of intermediate load control levels. Then, the operation change of the electric load changes following the change of the capacity of the battery or the voltage between the terminals as much as possible, and it is avoided that the operation change is excessively performed.

  Further, as described in claim 5, in the vehicle power supply control device according to claim 3 or 4, the load control level when the power is supplied from the battery by the level switching means is the intermediate load control. After switching to the level, based on the relationship between the intermediate load control level and the required level based on the battery capacity or the inter-terminal voltage set by the required level setting means after a predetermined time, from the battery Provided with a correction necessity determination means for determining whether or not the load control level needs to be corrected for power supply, when the change in the battery capacity or the voltage between the terminals is temporary, the load Switching of the control level is not excessively performed to the originally set demand level, and an excessive operation change of the electric load does not occur.

  Furthermore, as described in claim 6, in the vehicle power supply control device according to claim 2 or 5, the current load control level and the required level set by the required level setting means are more different. If the time change means for shortening the predetermined time is provided, even if the battery capacity or the voltage between the terminals is maintained after sudden change, even if the deviation from the current level of the load control level to the required level is large, An increase in the time required for switching the load control level is prevented.

  According to a seventh aspect of the present invention, in the vehicular power supply control apparatus according to any one of the first to sixth aspects, the required level setting means uses a vehicle together with the capacity of the battery or the voltage between terminals. If the required level is set on the basis of the season or time zone, the outside air temperature, or the operation history of a specific on-vehicle electric load, the season or time zone in which the vehicle is used, the outside air temperature, or a specific An appropriate load control level required level can be set in consideration of the operation history of the on-vehicle electric load.

  In addition, as described in claim 8, in the vehicle power supply control device according to any one of claims 1 to 6, the season or time zone in which the vehicle is used, the outside air temperature, or the specific on-vehicle electric load According to the operation history, if the load level is provided with threshold correction means for correcting the threshold of the battery capacity or the voltage between the terminals necessary for setting the required level by the required level setting means, Appropriately considering the battery capacity or terminal voltage threshold required to set the required control level, taking into account the season or time zone in which the vehicle is used, the outside temperature, or the operation history of a specific in-vehicle electrical load You can set anything.

  In this case, as described in claim 9, in the vehicle power supply control device according to claim 8, the threshold value correction means includes a season or time zone in which the vehicle is used, an outside air temperature, or the specific on-vehicle electric device. Correcting only the lower threshold of the battery capacity or the inter-terminal voltage threshold necessary for setting the required level by the required level setting means according to the load operation history; By doing so, it is possible to easily or difficult to set only the load control level corresponding to the battery capacity or the low terminal voltage side.

  Further, as described in claim 10, in the vehicle power supply control device according to any one of claims 1 to 6, the season or time zone in which the vehicle is used, the outside air temperature, or the specific on-vehicle electric device If an electric load changing means for changing the in-vehicle electric load grouped in each load control level according to the operation history of the load is provided, as the in-vehicle electric load grouped in each load control level, the vehicle It is possible to set an appropriate value in consideration of the season or time zone in which the is used, the outside air temperature, or the operation history of a specific on-vehicle electric load.

  Furthermore, as described in claim 11, in the vehicle power supply control device according to any one of claims 1 to 6, the level switching means further includes a season or time zone in which the vehicle is used, an outside air temperature, Alternatively, when the operation history of the specific on-vehicle electric load satisfies a predetermined condition, the load control level for supplying power from the battery is set by the request level setting means from the current load control level. Switching to the required level all at once, depending on the season or time zone in which the vehicle is used, the outside air temperature, or the operation history of a specific in-vehicle electric load, when the battery capacity or the voltage between terminals suddenly changes, the load The time required for switching the current control level from the current level to the required level can be shortened.

  According to the first to fifth aspects of the present invention, even when the required level set from the battery capacity or the voltage between the terminals is greatly deviated from the current level, the load control level can be quickly increased in a short time. Therefore, an excessive change in operation of the electric load can be suppressed.

  According to the sixth aspect of the present invention, even if the amount of change of the load control level from the current level to the required level is large, it is possible to prevent the time required for switching the load control level from becoming long.

  According to the seventh aspect of the invention, since the required level of the appropriate load control level is set in consideration of the season or time zone in which the vehicle is used, the outside air temperature, or the operation history of a specific in-vehicle electric load, Control of power supply to the in-vehicle electric load can be appropriately performed while suppressing a decrease in battery capacity.

  According to the inventions described in claims 8 and 9, an appropriate battery capacity or threshold voltage between terminals considering the season or time zone in which the vehicle is used, the outside air temperature, or the operation history of a specific in-vehicle electric load. Therefore, it is possible to appropriately control the power supply from the battery to the in-vehicle electric load while suppressing a decrease in the capacity of the battery.

  According to the invention of claim 10, the in-vehicle electric loads grouped into appropriate load control levels in consideration of the season or time zone in which the vehicle is used, the outside air temperature, or the operation history of a specific in-vehicle electric load. Therefore, it is possible to appropriately control the power supply from the battery to the in-vehicle electric load while suppressing a decrease in the capacity of the battery.

  Further, according to the invention of claim 11, depending on the season or time zone in which the vehicle is used, the outside air temperature, or the operation history of a specific in-vehicle electric load, when the capacity of the battery or the voltage between terminals suddenly changes, The time required for switching the load control level from the current level to the required level can be shortened.

  FIG. 1 shows a configuration diagram of a system including a vehicle power supply control device 10 according to an embodiment of the present invention. The vehicle power supply control device 10 of the present embodiment includes a battery 12 as a vehicle-mounted power supply, a power management electronic control unit (hereinafter simply referred to as a power control ECU) 14 that controls power supply (energization) from the battery 12, It has. The battery 12 is a storage battery using, for example, lead or lithium. The battery 12 is connected to various electric loads 16 mounted on the vehicle, which will be exemplified later. Each electric load 16 is permitted to operate by being supplied with power from the battery 12 mainly when the ignition is on.

  The power control ECU 14 is supplied with a voltage generated between the terminals of the battery 12 (hereinafter referred to as a battery voltage Vbatt) and calculated based on the battery voltage Vbatt and a current (battery current) flowing through the battery 12. A signal corresponding to the remaining capacity SOH is supplied. The power supply control ECU 14 detects the battery voltage Vbatt of the battery 12 and the remaining capacity SOH. Detection of the remaining capacity SOH of the battery 12 and the battery voltage Vbatt by the power control ECU 14 is performed every predetermined sampling period Ts (for example, 0.5 ms). In calculating the remaining capacity SOH of the battery 12, it is desirable to consider the battery temperature in order to increase the accuracy of the calculated value.

  An outside air temperature sensor 18 is connected to the power control ECU 14. The outside air temperature sensor 18 outputs a signal corresponding to the temperature generated outside the vehicle (hereinafter referred to as outside air temperature). The power supply control ECU 14 detects the outside air temperature based on the output signal of the outside air temperature sensor 18.

  An air conditioner ECU 20, a seat ECU 22, a door ECU 24, a front controller 26, and a steer ECU 28 are also connected to the power control ECU 14. These ECUs and controllers 20 to 28 are connected to an electric load 16 that is supplied with power from the battery 12 and controls the operation of the electric load 16.

  Specifically, the air conditioner ECU 20 is connected to the air conditioner loads A to F which are the electric loads 16. As the air conditioner loads A to F, for example, an air conditioner blower composed of an electric motor as a blower for air conditioning in a vehicle interior, an air conditioner seat blower composed of an electric motor as a blower for sending air to a vehicle seat, fogging of a rear window, etc. There is a defogger etc. to remove. Further, the seat ECU 22 is connected to seat loads A to C which are electrical loads 16. Examples of the seat loads A to C include a seat heater that warms a vehicle seat.

  The door ECU 24 is connected to a door load A that is an electric load 16. Examples of the door load A include a mirror heater that removes fogging of an outer mirror provided on a vehicle door. The front controller 26 is connected to front loads A to C which are electrical loads 16. Examples of the front loads A to C include a headlamp that is an illuminating device that illuminates the front of the vehicle, and a fog lamp that is an illuminating device that illuminates the vicinity of the vehicle when it is raining or when fog is generated. Further, the steer ECU 28 is connected to a steer load A that is an electric load 16. Examples of the steering load A include a steering heater that warms a steering wheel operated by a vehicle driver.

  Next, the operation of the vehicle power supply control device 10 of this embodiment will be described.

  FIG. 2 is a diagram showing an average current consumption consumed by each electric load 16 included in the vehicle power supply control device 10 of the present embodiment. FIG. 2 shows the current consumption consumed in the daytime in summer and the current consumed in the nighttime in winter. Further, FIG. 3 shows a level (hereinafter referred to as a load control level) indicating the remaining capacity SOH of the battery 12 and the priority (rank) for cutting and reducing the power supply from the battery 12 to each of the electric loads 16 in this embodiment. A map showing the relationship with Level is shown.

  In the present embodiment, each of the electric loads 16 (specifically, the air conditioner loads A to F, the seat loads A to C, the door load A, the front loads A to C, and the steer load A) are provided for convenience. As shown in FIG. 2, identification numbers No. 1 to No. 14 are assigned. Also, the load control level Level described above is the lowest level at which the power supply to the electric load 16 is cut or reduced, that is, the level 0 at which the number of electric loads 16 to be cut or reduced is the lowest, and the level at the highest level. It consists of four stages up to level 3, the highest number of electrical loads 16 that are high or cut off or reduced.

  The load control level 0 is a level that does not have the electric load 16 that cuts and reduces power supply, and is set when the remaining capacity of the battery 12 exceeds 60% (32 A · h), for example. The load control level 1 is a level having No1 and No2 as the electric loads 16 that cut the power supply and No3 to No5 as the electric loads 16 that reduce the power supply, and the remaining capacity of the battery 12 is 45% (25%, for example). .6A · h) and 60% or less. The load control level 2 is a level having No. 1 to No. 12 as the electric load 16 that cuts off the power supply, and the remaining capacity of the battery 12 exceeds, for example, 30% (19.2 A · h) and is 45% or less. Set in case. The load control level 3 is a level having No1 to No13 as the electric load 16 that cuts the power supply and No14 as the electric load 16 that reduces the power supply, and the remaining capacity of the battery 12 is, for example, 30% or less. Set to That is, each electric load 16 is individually prioritized so that power supply is cut and reduced according to the remaining capacity of the battery 12.

  In addition, by using the battery voltage Vbatt in place of the remaining capacity SOH of the battery 12 in FIG. 3, a map showing the relationship between the battery voltage Vbatt and the load control level Level is defined, and the load control level Level is set to the battery voltage Vbatt. The map may be set with reference to the map.

  FIG. 4 is a diagram for explaining a method of setting the load control level Level from the remaining capacity SOH of the battery 12 or the battery voltage Vbatt in the vehicle power supply control device 10 of the present embodiment. In this embodiment, a so-called hysteresis is provided in the map shown in FIG. 4 used for setting the load control level Level from the remaining battery capacity SOH or the battery voltage Vbatt.

  That is, first, considering the case where the remaining battery capacity SOH or the battery voltage Vbatt decreases, the load control level Level is equal to or lower than the first threshold value S1 (for example, 32 A · h) in the situation where the load control level Level is 0. Or when the battery voltage Vbatt falls below the first threshold value V1 (for example, 10.5 V), the level shifts from level 0 to level 1, and in the situation at level 1, the remaining capacity SOH is second. When the threshold value S2 (for example, 25.6 A · h) or less is reached, or when the battery voltage Vbatt becomes equal to or less than the second threshold value V2 (for example, 10 V), the level 1 is shifted to the level 2 and the level 2 is reached. In the situation, when the remaining capacity SOH is equal to or lower than the third threshold value S3 (for example, 19.2 A · h), or the battery voltage Vbatt is the third threshold value V3 (for example, 8). V) Shift from level 2 to level 3 when

  On the other hand, considering the case where the remaining battery capacity SOH or the battery voltage Vbatt rises, the remaining capacity SOH is equal to or higher than the first threshold value S1 (for example, 32 A · h) in the situation where the load control level Level is at level 2 or 3. Or when the battery voltage Vbatt becomes equal to or higher than the first threshold value V1 (for example, 10.5 V), the level shifts from level 2 or 3 to level 1; The level 1 is shifted to the level 0 when the threshold value S0 (for example, 38.4 A · h) or more is reached or when the battery voltage Vbatt becomes the zeroth threshold value V0 (for example, 11 V) or more.

  As described above, in the vehicle power supply control device 10 according to the present embodiment, as the remaining capacity SOH of the battery 12 or the battery voltage Vbatt decreases, the power supply (energization) from the battery 12 is cut or reduced. The number of loads 16 increases, and excessive operation of the electrical load 16 is restricted / prohibited. For this reason, when the capacity of the battery 12 is reduced, the capacity is less likely to decrease thereafter, and the capacity reduction is suppressed. Therefore, the life of the battery 12 is extended, and the battery rises on the road. The deterrent effect is obtained.

  Further, in this embodiment, the load control level Level realized when power is supplied from the battery 12 to the electric load 16 has hysteresis with respect to the remaining capacity SOH of the battery 12 or the battery voltage Vbatt. For this reason, even in a situation where the remaining capacity SOH of the battery 12 or the battery voltage Vbatt fluctuates little by little near the threshold value, it is unlikely that the load control level Level immediately returns to the level before the transition after the level transition once. The occurrence of hunting at the load control level is suppressed, and the stability of the operating state of the electrical load 16 is ensured.

  By the way, the remaining capacity SOH and the battery voltage batt of the battery 12 may show a transitional large sudden change due to the engine start, the electric load fluctuation or the like. When such a sudden change occurs, the load control level (required level) to be realized is set based on the remaining capacity SOH or the battery voltage batt, and the actual load control level Level is faithfully and responsive with the sudden change. If the sudden change is temporary, the control is canceled immediately after the cut or reduction of the power supply to the electric load 16 is executed or the power supply is switched. Immediately after the cut or reduction is released, the control is started again, and the operating state of the electric load 16 changes frequently and excessively. Therefore, the vehicle power supply control device 10 of the present embodiment suppresses an excessive change in the operating state of the electric load even when a large sudden change in the battery state occurs.

  5 and 6 each show an example of an operation time chart realized when the load control level is actually switched in the vehicle power supply control device 10 of the present embodiment. 5A and 6A show the change over time of the remaining capacity SOH of the battery 12 or the battery voltage Vbatt, and FIGS. 5B and 6B show the actual load control level. The time change of Level is shown respectively. 5B and 6B, the time change of the load control level Level in the present embodiment is indicated by a solid line, and the detected value and threshold value of the remaining capacity SOH of the battery 12 or the battery voltage Vbatt The time change of the load control level Level when the above comparison results are followed with good responsiveness (hereinafter, this configuration is referred to as proportional) is indicated by broken lines.

  That is, as shown in FIG. 5, in the situation where the actual load control level Level for supplying power from the battery 12 to the electric load 16 is level 0, the remaining capacity SOH of the battery 12 or the battery voltage Vbatt detected is When the first threshold value S1, V1 is exceeded (time (t1-Ts)), the required level of the load control level Level is set to level 0, and the actual load control level Level is maintained at that level 0. The

  In this state, when the remaining capacity SOH of the battery 12 or the battery voltage Vbatt becomes equal to or lower than the first threshold value S1, V1 and lower than the second threshold value S2, V2 at time t1, the required level of the load control level Level becomes level 2. Is set. In contrast, when the required level is set, the actual load control level Level is immediately switched from level 0 to level 2 as indicated by a broken line in FIG. Further, when the remaining capacity SOH of the battery 12 or the battery voltage Vbatt becomes equal to or lower than the third threshold value S3, V3 at time t2 (= t1 + Ts), the required level of the load control level Level is set to level 3, and As shown by a broken line in FIG. 5, the actual load control level Level is immediately switched from level 2 to level 3.

  On the other hand, in this embodiment, even if the request level is set from level 0 to level 2 at time t1, the actual load control level Level does not immediately switch from request level 0 to the request level 2. First, It is determined whether or not the state in which the request level 1 or the request level 2 is set continues for a predetermined time T1 (for example, 5 seconds). Then, when it is determined that the state in which the request level is set to level 1 or 2 has continued for a predetermined time T1, at that time (time t3 = (t1 + T1)), as shown by the solid line in FIG. Level Level switches from level 0 to level 1 first.

  After such switching, whether or not the required level is set to levels 0, 2, and 3 different from level 1 based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt, that is, the actual value after switching. When it is determined whether correction from the current state of the load control level Level is necessary based on the difference between the load control level Level and the required level, and when it is determined that the load control level needs to be corrected Then, it is determined whether or not the request level setting state continues for a predetermined time T1. When it is determined that the state in which the request level is set to level 2 or 3 has continued for a predetermined time T1, the actual load control level at that time (time t4 = (t1 + 2T1) as shown by the solid line in FIG. Level then switches from level 1 to level 2.

  Further, when such switching is performed, thereafter, whether or not the required level is set to levels 0, 1, 3 different from level 2 based on the remaining capacity SOH of battery 12 or battery voltage Vbatt, that is, load control. When it is determined whether or not the correction of the level Level from the current state is necessary, and when it is determined that the load control level needs to be corrected, whether or not the required level setting state continues for a predetermined time T1. It is determined whether or not. When it is determined that the state in which the request level is set to level 3 continues for a predetermined time T1, the actual load control level Level is set at that time (time t5 = (t1 + 3T1) as shown by a solid line in FIG. Switch from level 2 to level 3.

  Similarly, as shown in FIG. 6, when the actual load control level Level is maintained at level 0, the remaining capacity SOH of the battery 12 or the battery voltage Vbatt is equal to or lower than the first threshold values S1, V1 at time t11. When the required level of the load control level Level is set to level 2 by becoming the threshold values S2 and V2 or less, as shown by the broken line in FIG. Switch to level 2 at once. Further, when the remaining capacity SOH of the battery 12 or the battery voltage Vbatt is equal to or lower than the third threshold value S3, V3 at time t12 (= t11 + Ts), the required level of the load control level Level is set to level 3. In contrast, the actual load control level Level immediately switches from level 2 to level 3 as shown by the broken line in FIG.

  Further, when the remaining capacity SOH of the battery 12 or the battery voltage Vbatt exceeds the first threshold values S1 and V1 at time t13 (= t12 + Ts), the required level of the load control level Level is set to level 1. In proportion, the actual load control level Level immediately switches from level 3 to level 1 as shown by the broken line in FIG. Further, at time t14 (= t13 + Ts), the remaining capacity SOH of the battery 12 or the battery voltage Vbatt exceeds the first threshold values S1 and V1 and is equal to or lower than the zeroth threshold values S0 and V0, so that the load control level Level When the required level is set to level 1, the actual load control level Level is maintained at level 1 as shown by the broken line in FIG.

  On the other hand, in this embodiment, even if the request level is set from level 0 to level 2 at time t11, the actual load control level Level does not immediately switch from request level 0 to the request level 2. First, It is determined whether or not the state in which the request level 1 or the request level 2 is set continues for a predetermined time T1. If the state in which the request level is set to level 1 or 2 does not continue for the predetermined time T1, the actual load control level Level is level 0 as shown by the solid line in FIG. 6 even if the predetermined time T1 has elapsed. Maintained.

  FIG. 7 shows a flowchart of an example of a control routine executed by the power supply control ECU 14 in the vehicle power supply control device 10 of the present embodiment in order to realize the above function. The routine shown in FIG. 7 is a routine that is started when the actual load control level Level is at level 0. When the actual load control level Level is in levels 1 to 3, a routine provided separately from the routine shown in FIG. 7 corresponding to levels 1 to 3 is started. Hereinafter, a case where the actual load control level Level is at level 0 will be mainly described. When the routine shown in FIG. 7 is started, first, the process of step 100 is executed.

  In step 100, the required level of the load control level indicating the priority for cutting / reducing the power supply from the battery 12, which is set based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt detected every sampling period Ts. Is one of levels 1 to 3. As a result, when the required level is level 0, the current actual load control level Level is level 0, and it is not necessary to switch the actual load control level Level. Therefore, when such a determination is made, the current routine is terminated without any further processing. On the other hand, when the required level is level 1 to 3, since the current actual load control level Level is level 0, it can be determined that the actual load control level Level is required to be switched to a low level. Therefore, if such a determination is made, the process of step 102 is executed next.

  In step 102, whether or not a predetermined time T1 has elapsed since the request level was set to levels 1 to 3 based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt, that is, the request level is at least at levels 1 to 3 is set. It is determined whether or not the state set to any one continues for a predetermined time T1. As a result, when it is determined that the predetermined time T1 has not elapsed, the process of step 100 is repeatedly executed. On the other hand, if it is determined that the predetermined time T1 has elapsed, the process of step 104 is performed next.

  In step 104, processing for actually switching the load control level from level 0 to level 1 is executed. When the processing of this step 104 is executed, the air conditioner loads A and B (No1, No. 1) from the battery 12 as the electric load 16 from the state where there is no electric load 16 from which the power supply from the battery 12 is cut / reduced thereafter. The power supply to No. 2) is cut, and a transition is made to a state where the power supply to the air conditioner load C (No. 3), the seat load A (No. 4), and the air conditioner load D (No. 5) is reduced.

  In step 106, it is determined whether or not the required level of the load control level set based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt is level 2 or 3. As a result, when the requested level is level 0 or 1, it is determined that there is no need to switch the actual load control level from the current level, or that the actual load control level is requested to be switched to a higher level. it can. Therefore, when such a determination is made, the current routine is terminated. On the other hand, when the request level is level 2 or 3, it can be determined that switching to the low level of the actual load control level Level is requested. Therefore, if such a determination is made, the process of step 108 is executed next.

  In step 108, whether or not a predetermined time T1 has elapsed since the required level is set to level 2 or 3 based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt, that is, the required level is at least level 2 or 3 is determined. It is determined whether or not the state set to any one continues for a predetermined time T1. As a result, when it is determined that the predetermined time T1 has not elapsed, the process of step 106 is repeatedly executed. On the other hand, if it is determined that the predetermined time T1 has elapsed, the process of step 110 is performed next.

  In step 110, processing for actually switching the load control level from level 1 realized in step 104 to level 2 is executed. When the processing of step 110 is executed, the power supply from the battery 12 to the No1 and No2 electric loads 16 is cut and the power supply to the No3 to No5 electric loads 16 is reduced. The transition to the state where the power supply to the electric loads 16 of No1 to No12 is cut is made.

  In step 112, it is determined whether or not the required level of the load control level set based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt is level 3. As a result, when the requested level is level 0 to 2, there is no need to switch the actual load control level Level from the current state, or it is requested to switch the actual load control level Level to a higher level. I can judge. Therefore, when such a determination is made, the current routine is terminated. On the other hand, when the requested level is level 3, it can be determined that switching to the low level of the actual load control level Level is requested. Therefore, if such a determination is made, the process of step 114 is executed next.

  In step 114, whether or not a predetermined time T1 has elapsed since the request level is set to level 3 based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt, that is, the request level is set to level 3. It is determined whether or not it continues for a predetermined time T1. As a result, when it is determined that the predetermined time T1 has not elapsed, the process of step 112 is repeatedly executed. On the other hand, if it is determined that the predetermined time T1 has elapsed, the process of step 116 is performed next.

  In step 116, processing for actually switching the load control level from level 2 realized in step 110 to level 3 is executed. When the process of step 116 is executed, the power supply from the battery 12 to the No. 1 to No. 12 electric loads 16 is cut from the state where the electric power supply to the No. 1 to No. 13 electric loads 16 is cut. , No14 is shifted to a state where power supply to the electric load 16 (front load C) is reduced. When the processing of step 116 is finished, the current routine is finished.

  According to the routine shown in FIG. 7, when the actual load control level Level is at level 0, when the required level is set to levels 1 to 3 based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt, Thereafter, switching of the actual load control level Level can be executed only when the set state continues for a predetermined time T1. Similarly, even in a situation where the actual load control level Level is at level 1, level 2 or level 3, the required level becomes a level other than the actual actual load control level Level based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt. In the case of setting, thereafter, switching of the actual load control level Level can be executed only when the set state continues for a predetermined time T1.

  Further, after the actual load control level Level is switched once, the difference between the actual load control level Level after the switching and the required level based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt detected at each sampling period is obtained. Based on this, it is determined whether or not correction of the load control level Level from the current state is necessary, and a state in which the correction is necessary, that is, a state where the requested level is different from the current load control level Level is a predetermined time. Only when it continues for T1, switching to the next level of the actual load control level Level can be executed.

  That is, in this embodiment, when the setting state of the required level does not continue for the predetermined time T1, the actual load control level Level is not switched. For this reason, even when the detected remaining capacity SOH of the battery 12 or the battery voltage Vbatt is suddenly changed, the state in which power is supplied from the battery 12 to the electric load 16 and the cut / reduction thereof are performed. It is difficult for the state to change, and the operating state of the electric load 16 is prevented from frequently changing.

  Further, according to the routine shown in FIG. 7, the required level set based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt under the situation where the actual load control level Level is level 0 is level 2 or 3. If there is an intermediate load control level (level 1 or level 1 and level 2) between the actual load control level Level (level 0) and the required level (level 2 or 3), the actual load Switching from the current level (level 0) of the control level Level can be performed one step at a time every predetermined time T1 via the intermediate level. Similarly, when the actual load control level Level is at level 1, level 2 or level 3, and there is an intermediate load control level between the actual load control level Level and the required level, the actual load control level The level can be switched from the current state in order one step at a predetermined time T1 via an intermediate level.

  That is, in the present embodiment, the actual load control level Level is the current level when the required level set based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt is greatly deviated from the current actual load control level Level. Bypassing an intermediate level from a level and switching to the required level in a short time does not occur. For this reason, even when the remaining capacity SOH of the battery 12 or the battery voltage Vbatt is largely decreased or temporarily changed, the state in which power is supplied from the battery 12 to the electric load 16 and its cut. -It is difficult to cause a change from the state in which the reduction is performed, and an excessive change in the operating state of the electric load 16 can be suppressed, and the stability of the operating state of the electric load 16 is ensured.

  Therefore, according to the vehicle power supply control device 10 of the present embodiment, it is possible to minimize a sense of incongruity due to an excessive change in the operating state of the electric load 16 for the vehicle occupant, and to maintain the remaining capacity SOH of the battery 12 or the battery voltage Vbatt It is possible to optimize the power supply from the battery 12 to the electric load 16 regardless of the fluctuations.

  Further, in the present embodiment, in the situation where the actual load control level is the highest level at which the power supply to the electric load 16 is cut and reduced, that is, the lowest level 3 at which the power supply is performed, the remaining capacity of the battery 12 Even if the required level based on SOH or the battery voltage Vbatt is level 2, unless the level becomes level 1 or 0, the actual load control level is not switched from the lowest level to the higher level. In such a configuration, the operation of the electric load 16 by the power supply from the battery 12 is limited until the battery 12 recovers to a certain large capacity, so that the recovery of the battery 12 can be accelerated. Yes.

  Furthermore, in the present embodiment, in a situation where the actual load control level is at the lowest level 3 where power is supplied to the electric load 16, the required level based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt is level 0. In this case, the actual load control level is first switched from level 3 to level 1 by bypassing level 2 and then from level 1 to level 0 after a predetermined time has elapsed. That is, in this case, when the load control level is switched from the level 3, first, the load level is switched to the level 1 closer to the required level among the intermediate levels 1 and 2 between the current level 3 and the required level 0. In such a configuration, the load control level switches as much as possible to the change in the remaining capacity SOH or the battery voltage Vbatt of the battery 12, so that the operation of the electric load 16 follows as much as possible to the change in the remaining capacity SOH of the battery 12 or the battery voltage Vbatt. Thus, it is possible to avoid excessive changes while changing.

  FIG. 8 shows the relationship between the difference between the actual load control level Level and the required level in the vehicle power supply control device 10 of the present embodiment and the predetermined time T1 that the required level should continue for switching the actual load control level Level. A map showing is shown. By the way, in the present embodiment, as described above, when an intermediate load control level exists between the actual load control level Level and the required level, switching from the actual load control level Level to the intermediate level is performed. This is performed one step at a time for every predetermined time T1. In such a configuration, assuming that the predetermined time T1 is always maintained at a large constant value, when the difference between the actual load control level Level and the requested level is large, the requested level from the initial actual load control level Level is obtained. There is a possibility that a large amount of time is consumed before switching to, and switching responsiveness may be performed.

  Therefore, in the present embodiment, the predetermined time T1 that the requested level should continue when switching the actual load control level Level is the magnitude of the difference between the actual load control level Level and the requested level as shown in the map of FIG. It is good also as making it change according to, specifically, shortening, so that the gap is large. In this case, in the process until the actual load control level Level is switched from the initial level to the initial required level, the predetermined time T1 initially calculated from the magnitude of the deviation may be used continuously. Further, every time the actual load control level Level is switched, a predetermined time T1 calculated from the magnitude of the difference between the actual load control level and the required level set at that time may be used.

  According to such a configuration, when the required level based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt is greatly deviated from the current actual load control level Level, the actual load control level Level is easily switched from the current level to the required level. Therefore, it is possible to prevent the time required for the switching from becoming long, and to shorten the time. For this reason, even when the battery 12 has caused a sudden large decrease in function due to, for example, a capacity decrease or a voltage decrease, the number of electric loads 16 to be cut from the power supply from the battery 12 is relatively short. Since it increases, it becomes possible to suppress the further function fall of the battery 12, or to aim at the function recovery of the battery 12 promptly.

  In the above-described embodiment, the electric load 16 corresponds to the “vehicle electric load” described in the claims, and the power control ECU 14 is based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt. By referring to a map as shown in FIG. 3, the request level of the load control level indicating the priority (order) for cutting / reducing the power supply from the battery 12 to each of the electric loads 16 is set. The "required level setting means" described in the range executes the routine as shown in FIG. 7 in a situation where the actual load control level is in the level 0 to 3, so that the "level switching means" described in the claims is By executing the processing of Steps 100, 106, and 112, the “correction necessity determination means” described in the claims is set to the actual load control level As the difference between the Level and the required level is larger, the “time changing means” described in the claims is realized by shortening the predetermined time T1 that the required level should continue in switching the actual load control level Level. Has been.

  By the way, in said Example, as the vehicle-mounted electric load 16 which is supplied with electric power from the battery 12, the air conditioner loads A to F, the seat loads A to C, the door loads A, the front loads A to C, and the steering load A are used. However, the present invention is not limited to this, and may be applied to a part of these or other electric loads such as a display.

  In the above embodiment, four levels of load control levels set based on the remaining capacity SOH of the battery 12 or the battery voltage Vbatt are provided.

  In the above embodiment, the remaining capacity SOH of the battery 12 or the battery voltage Vbatt is used as a parameter for setting the required level of the load control level. However, the relationship between the two may be used. . Also, the outside air temperature by the outside air temperature sensor 18 may be used together with the remaining capacity SOH of the battery 12 or the battery voltage Vbatt. When the outside air temperature is low, compared with the case where the outside air temperature is high, it is easy to take out the electric power from the battery 12 by the electric load 16, and the function of the battery 12 is likely to deteriorate significantly. Therefore, even if the battery remaining capacity SOH or the battery voltage Vbatt is the same, when the outside air temperature is low, a lower one than the required level may be set as compared with the case where the outside temperature is high. According to such a configuration, it is possible to suppress the battery 12 from causing a significant deterioration in function when the outside air temperature is low, and therefore it is possible to realize setting of an appropriate required level in consideration of the outside air temperature. The power supply from the battery 12 to the electric load 16 can be appropriately controlled.

  Further, instead of or together with the detection of the outside air temperature directly using the outside air temperature sensor 18, the power supply control ECU 14 has a clock function and can detect the season or time zone in which the vehicle is used. Alternatively, in the configuration having the relationship between the time zone and the outside temperature of the normal year as a map provided in advance in the storage device or from the external infrastructure outside the vehicle, the outside temperature is detected indirectly by detecting the season and the time zone. It is good. In this case, the required level is set in consideration of the detected season and time zone. According to such a configuration, it is possible to suppress the battery 12 from causing a significant deterioration in the season or time zone in which it is determined that the outside air temperature is low. The required level can be set, and the power supply from the battery 12 to the electric load 16 can be appropriately controlled.

  Furthermore, in setting the required level, the operation history of the electric load 16 (mainly heaters that are frequently used in cold and winter seasons) is considered together with the remaining capacity SOH of the battery 12 or the battery voltage Vbatt. It is good to do. When such an electric load 16 is frequently used in practice, the battery 12 is likely to be significantly deteriorated. On the other hand, when the electric load 16 is not used so much, the battery 12 is hardly deteriorated. Therefore, even if the remaining battery capacity SOH or the battery voltage Vbatt is the same, when such a specific electric load 16 is frequently used, it is lower than the required level compared to when it is not used much. If a thing is set, it can suppress that the battery 12 causes a remarkable function fall. In this case, in this case, setting of an appropriate required level in consideration of the operation history of the specific electric load 16 is realized, and control of power supply from the battery 12 to the electric load 16 is appropriately performed.

  In the above-described modification, when setting the required level, the outside temperature, the season, the time zone, or the operation history of the specific electric load 16 is considered together with the remaining capacity SOH of the battery 12 or the battery voltage Vbatt. However, it is good also as using the structure shown below.

  FIG. 9 shows a map representing the relationship between the remaining capacity SOH of the battery 12 and the load control level Level in the modification of the present invention. 9A shows a map at normal time (when the outside air temperature is relatively high and when the specific electric load 16 is used less frequently), and FIGS. 9B and 9C show an outside map. The maps when the temperature is relatively low and when the specific electric load 16 is frequently used are respectively shown. That is, the threshold value of the remaining capacity SOH or the battery voltage Vbatt that divides each level of the load control level necessary for setting the required level of the load control level is set as shown in FIG. Or it is good also as correcting according to the operation history of the specific electric load 16. At this time, each threshold value may be corrected (see FIGS. 9A and 9B), or only the lower one of the threshold values may be corrected ( (See FIGS. 9A and 9C).

  In such a configuration, the threshold value is corrected to a higher level when the outside air temperature is low than when the outside air temperature is high, and when the specific electric load 16 is frequently used, the threshold value is not used much. If the correction is made higher than when not performed, it is possible to suppress the battery 12 from causing a significant deterioration in function. In this case, in this case, as a threshold value of the battery capacity or the voltage between terminals necessary for setting the required level of the load control level, the outside air temperature, the season, the time zone, and the operation history of the specific electric load 16 are obtained. It is possible to realize setting of an appropriate value in consideration, and it is possible to appropriately control power supply from the battery 12 to the electric load 16.

  FIG. 10 shows a map showing the relationship between the remaining capacity SOH of the battery 12 and the load control level Level in the modification of the present invention. FIG. 10A shows a map during normal times (when the outside air temperature is relatively high and when the specific electric load 16 is used less frequently), and FIG. 10B shows a relatively outside air temperature. The maps when the temperature is low and when the specific electric load 16 is frequently used are respectively shown. While maintaining the same threshold value for dividing each of the load control levels 0 to 3, the electric loads 16 grouped into these load control levels are represented by the outside temperature, season, time zone, Alternatively, the correction may be performed according to the operation history of the specific electric load 16, for example, the electric load 16 that is not the target of the power supply cut at level 1 may be the target of the power supply cut. .

  In such a configuration, when the outside air temperature is low, the electric load 16 is included in the higher one (level 0 side) that cuts and reduces the power supply compared to the warm time when the outside air temperature is high. Include more electrical loads 16 on the higher level (on the level 0 side) that cuts / reduces the power supply than when a particular electrical load 16 is frequently used compared to when it is not used much If so, it is possible to suppress the battery 12 from causing a significant decrease in function. In this case, in this case, as the electric loads 16 grouped in each load control level, it is possible to realize an appropriate setting in consideration of the outside air temperature, the season, the time zone, and the operation history of the specific electric load 16. This is possible, and the power supply from the battery 12 to the electric load 16 can be appropriately controlled.

  In the above embodiment, when the required level is significantly different from the current level, the actual load control level is switched from the current level to the required level one step at a time in sequence. When it is determined that the temperature is extremely cold, for example, from the temperature or season, the actual load control level may be quickly switched from the current level to the required level in a short time when the battery 12 is degraded. According to such a configuration, the time required for switching the actual load control level from the current level to the required level when the function of the battery 12 is reduced is shortened, so that it is difficult to carry out power from the battery 12 and the function of the battery 12 is significantly reduced. Generation | occurrence | production is prevented and the function maintenance and function recovery will be aimed at.

  Further, in the above embodiment, the load control level is switched, but the region where the vehicle is used (Hokkaido, Okinawa, etc.) is not considered, but the vehicle detected using the navigation device travels. You may consider the region. For example, when the outside air temperature is indirectly detected from the season or time zone, this detection area may be taken into account.

1 is a configuration diagram of a system including a vehicle power supply control device according to an embodiment of the present invention. It is a figure showing the average consumption current which each electric load which the vehicle power supply control apparatus of a present Example has consumes. It is the map showing the relationship between the remaining capacity of a battery and a load control level in a present Example. It is a figure for demonstrating the method of setting a load control level from the remaining capacity or battery voltage of a battery in the vehicle power supply control device of a present Example. It is an operation | movement time chart implement | achieved when actually switching a load control level in the vehicle power supply control device of a present Example. It is an operation | movement time chart implement | achieved when actually switching a load control level in the vehicle power supply control device of a present Example. It is a flowchart of the control routine performed in the vehicle power supply control device of the present embodiment. 5 is a map showing a relationship between a difference between an actual load control level and a required level and a predetermined time during which the required level should be continued when switching the actual load control level in the vehicle power supply control device of the present embodiment. It is the map showing the relationship between the remaining capacity of a battery and the load control level in the modification of this invention. It is the map showing the relationship between the remaining capacity of a battery and the load control level in the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle power supply control device 12 Battery 14 Power supply control ECU
16 Electric load 18 Outside temperature sensor

Claims (11)

A vehicle power supply control device comprising: a battery that stores electric power; and a plurality of on-vehicle electric loads that are driven by power supply from the battery, and controls power supply from the battery to each on-vehicle electric load,
A load control level of three or more stages indicating a priority degree related to power supply from the battery to each of the plurality of in-vehicle electric loads;
Request level setting means for setting a required level of the load control level to be realized when power is supplied from the battery based on the capacity of the battery or the voltage between terminals;
Level switching means for switching the load control level for power supply from the battery from the current load control level to the required level set by the required level setting means step by step;
A vehicle power supply control device comprising:   Each time the load control level for supplying power from the battery by the level switching means is switched step by step, the load control level after switching and the battery level set by the request level setting means after a predetermined time are set. A correction necessity determination unit is provided that determines whether or not the load control level needs to be corrected when power is supplied from the battery based on a relationship with the required level based on a capacity or a voltage between terminals. The vehicle power supply control device according to claim 1. A vehicle power supply control device comprising: a battery that stores electric power; and a plurality of on-vehicle electric loads that are driven by power supply from the battery, and controls power supply from the battery to each on-vehicle electric load,
A load control level of three or more stages indicating a priority degree related to power supply from the battery to each of the plurality of in-vehicle electric loads;
Request level setting means for setting a required level of the load control level to be realized when power is supplied from the battery based on the capacity of the battery or the voltage between terminals;
When the intermediate load control level exists between the current load control level and the request level set by the request level setting means, the load control level for supplying power from the battery is First, level switching means for switching from the current load control level to the intermediate load control level, and then switching from the intermediate load control level to the required level;
A vehicle power supply control device comprising:   When there are a plurality of intermediate load control levels, the level switching means first sets the load control level for supplying power from the battery from the current load control level to a plurality of the intermediate load control levels. 4. The vehicle power supply control device according to claim 3, wherein the load control level is switched to a level closer to the required level set by the required level setting means.   After the load control level for supplying power from the battery by the level switching means is switched to the intermediate load control level, the intermediate load control level and the required level setting means after a predetermined time Correction necessity determination means for determining whether or not the load control level needs to be corrected when power is supplied from the battery based on the relationship with the required level based on the capacity of the battery or the voltage between terminals. The vehicular power supply control device according to claim 3, further comprising:   The time change means which shortens the said predetermined time, so that the said present load control level and the said request level set by the said request level setting means have deviated is provided. Vehicle power supply control device.   The required level setting means sets the required level based on the battery capacity or the voltage between terminals, the season or time zone in which the vehicle is used, the outside air temperature, or the operation history of a specific on-vehicle electric load. The vehicular power supply control device according to any one of claims 1 to 6.   Between the capacity or terminals of the battery necessary for setting the required level by the required level setting means according to the season or time zone in which the vehicle is used, the outside air temperature, or the operation history of the specific on-vehicle electric load The vehicle power supply control device according to any one of claims 1 to 6, further comprising a threshold value correcting unit that corrects a threshold value of the voltage.   The threshold value correcting means is necessary for setting the required level by the required level setting means according to the season or time zone in which the vehicle is used, the outside air temperature, or the operation history of the specific on-vehicle electric load. 9. The vehicle power supply control device according to claim 8, wherein only the lower threshold value of the battery capacity or the terminal voltage threshold value is corrected.   Electric load changing means for changing the in-vehicle electric load grouped in each load control level according to the season or time zone in which the vehicle is used, the outside air temperature, or the operation history of the specific in-vehicle electric load The vehicle power supply control device according to any one of claims 1 to 6.   The level switching means is also configured to supply power from the battery when a season or time zone in which the vehicle is used, an outside air temperature, or an operation history of a specific on-vehicle electric load satisfies a predetermined condition. The vehicular power supply control device according to any one of claims 1 to 6, wherein a load control level is switched at a stroke from the current load control level to the required level set by the required level setting means.

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