JP2021121517A - Vehicular power control device - Google Patents

Abstract

To address a problem such that according to conventional vehicular load control devices, since the priority is set for each load in accordance with the number of times of switch operations by a person in a vehicle, it is difficult for the person in the vehicle to get a satisfaction.SOLUTION: According to a vehicular power control device 10 of the present invention, threshold calculation means 11A calculates a threshold using the respective operating hours of loads 17 to 21, and priority determination means 11B determines the priority for operating each load 17 to 21 using the threshold. Consequently, the threshold is calculated in accordance with the actual operating hours of the respective loads 17 to 21, and becomes a value that satisfies the demand of a person in a vehicle. Hence, the person in the vehicle can get a satisfaction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle power control device, and in particular, gives a priority to an electric load mounted on the vehicle (hereinafter, simply referred to as a load) according to the traveling condition of the vehicle, and sets the priority to the priority. The present invention relates to a vehicle power control device that realizes safe driving of a vehicle while increasing occupant satisfaction by controlling the power supplied to a load from a battery or a generator accordingly.

As a conventional load control device for vehicles, when operation requests are made for a plurality of loads at the same time, these loads are duty-controlled and these loads are simultaneously operated by controlling each duty output alternately. The device is known. Then, in the vehicle load control device, by changing the duty ratio according to the frequency of the occupant's operation request, it is possible to more accurately respond to the occupant's request.

Specifically, the vehicle load control device counts the number of times each switch of each load is turned on within a predetermined time after the vehicle is started, and sets the duty ratio according to the difference between the counts. do. In other words, by setting the priority for each load according to the number of switch operations of the occupant, in other words, the frequency of operation request, and controlling the change of each duty ratio, the load that is frequently operated according to the request of the occupant. Can be preferentially operated with a large duty ratio. As a result, the vehicle load control device can increase the satisfaction level of the occupant by more accurately responding to the request of the occupant (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 06-107089

As described above, in the conventional load control device for vehicles, priority is set for each load according to the number of switch operations of the occupant, and the change of each duty ratio is controlled. In this control method, for example, in a vehicle air conditioner, depending on the occupant, the operation switch may be kept on at all times. In this case, since the number of times the occupant switches are operated is reduced, the vehicle air conditioner is actually used all the time, and despite the fact that the occupant has a high priority, the above control method is used. There is a problem that it becomes difficult to satisfy the satisfaction of the occupants because the priority is lowered and the operation is performed with a small duty ratio.

That is, in the conventional control method of the vehicle load control device, although it depends on the operation method of the occupant's switch, the occupant's request may not be reflected in the number of switch operations, and the load reflects the occupant's request more accurately. There is a problem that it is difficult to control.

The present invention has been made in view of the above circumstances, and the load mounted on the vehicle is given a priority according to the traveling condition of the vehicle and the load is loaded from the battery or the generator according to the priority. It is an object of the present invention to provide a vehicle electric power control device that realizes safe driving of a vehicle while increasing occupant satisfaction by controlling the electric power supplied to the vehicle.

The vehicle power control device according to claim 1 of the present invention stores a battery mounted on the vehicle, a load mounted on the vehicle and operated by the electric power supplied from the battery, and an operating time of the load. A storage means to be used, a sensor for measuring various situations of the vehicle, a threshold calculation means for calculating the threshold of the load using the operating time, and storing the threshold in the storage means, the threshold and the sensor. It is provided with a priority determination means for determining the priority for operating the load by comparing with the current measured value according to the above, and a power control means for adjusting the power supplied to the load according to the priority. It is characterized by.

Further, in the vehicle power control device according to claim 2 of the present invention, the storage means accumulates and stores the operating time for each operation of the vehicle, and the threshold calculation means accumulates and stores the operating time for each operation of the vehicle. It is characterized in that the threshold value is calculated and the latest threshold value is stored in the storage means.

Further, in the vehicle power control device according to claim 3 of the present invention, the load receives the power adjustment by the power control means and the first group that does not receive the power adjustment by the power control means. The priority determination means is divided into a second group, and the priority of the load divided into the second group is adjusted to at least the first level and the power is adjusted before the first level. It is characterized in that it is determined to be the second level to be performed.

Further, the vehicle power control device according to claim 4 of the present invention further includes a battery state detecting means for detecting the charging state of the battery, and the battery state detecting means has a battery voltage of the second. When it is detected that the value is lower than the determination value of 1, the power control means stops or limits the supply of the power to the load determined to be the second level of the second group. ..

Further, in the vehicle power control device according to claim 5, the battery state detecting means has detected that the voltage of the battery is lower than the second determination value lower than the first determination value. In some cases, the power control means stops the supply of the power to all the loads in the second group.

Further, the vehicle power control device according to claim 6 of the present invention further includes a peripheral environment recognizing means for recognizing the surrounding environment of the vehicle, and the peripheral environment recognizing means poses a danger to the vehicle. When recognizing and notifying the occupants of the vehicle of a warning, the electric power control means stops supplying the electric power to all the loads of the second group.

Further, in the vehicle power control device according to claim 7, the sensor is a temperature sensor, and the load included in the second group is an air conditioner, a steering heater, or a seat heater. It is a feature.

Further, in the vehicle power control device according to claim 8 of the present invention, the sensor is an illuminance sensor, and the load included in the second group is an outdoor light or an interior light.

Further, the vehicle power control device according to claim 9 of the present invention is characterized in that the load included in the first group is an electronic control device that controls traveling, stopping, or steering of the vehicle. ..

In the vehicle power control device according to claim 1, the threshold value calculating means calculates a threshold value using the operating time of the load, and the priority determining means uses the above threshold value to operate the load. To judge. As a result, the above threshold value is calculated based on the actual operating time, not the number of times the operation switch of each load of the vehicle occupant is operated, and is a value that satisfies the request of the vehicle occupant. , The power supply is adjusted according to the condition of the battery, but the satisfaction of the occupants can be satisfied.

Further, in the vehicle power control device according to claim 2 of the present invention, the threshold value calculation means accumulates and calculates the threshold value for each operation of the vehicle, and updates the threshold value according to the request of the occupant of the vehicle. , The operating status of the load can be adjusted according to the occupant's request, and the occupant's satisfaction can be improved.

Further, the vehicle power control device according to claim 3 of the present invention does not limit the supply of electric power to the load belonging to the first group that controls the running, stopping, or steering of the vehicle, and belongs to the second group. By selectively supplying electric power to the load, it is possible to increase the satisfaction of the occupants while realizing safe driving of the vehicle.

Further, in the vehicle power control device according to claim 4 of the present invention, when the battery state detecting means detects the first determination value of the battery voltage, the power controlling means appropriately sets the second group. By adjusting the power supply with respect to the internal load, the load can be controlled according to the occupant's request and the occupant's satisfaction can be enhanced.

Further, in the vehicle power control device according to claim 5 of the present invention, when the battery state detecting means detects the second determination value of the battery voltage, the power controlling means is included in the second group. By stopping the supply of electric power to all the loads, it is possible to prevent an uncontrollable state of the vehicle due to insufficient electric power supply, for example, the auxiliary force of the electric power steering or the electric brake is lost.

Further, in the vehicle power control device according to claim 6, when the surrounding environment recognition means recognizes the danger of the vehicle and notifies the occupant of the danger, the power control means second. By stopping the supply of electric power to all the loads in the group, it is possible to more reliably avoid the danger of the vehicle.

Further, in the vehicle power control device according to claim 7, the threshold calculation means calculates a threshold using a temperature sensor such as a room temperature sensor for a load whose occupant's necessity changes depending on the temperature. be able to.

Further, in the vehicle power control device according to claim 8 of the present invention, the threshold value calculation means can calculate the threshold value by using the illuminance sensor for the load that can be measured by the irradiation amount.

Further, in the vehicle power control device according to claim 9 of the present invention, the electronic control device that controls the running, stopping, or steering of the vehicle belongs to the first group of loads, so that the vehicle can run safely. It can be realized.

It is a block diagram which shows the outline of the electric power control device for a vehicle which is one Embodiment of this invention. It is a flowchart explaining the control operation of the threshold value calculation means of the electric power control device for a vehicle which is one Embodiment of this invention. It is (A) graph and (B) graph explaining the threshold value calculation method by the threshold value calculation means of the vehicle power control device which is one Embodiment of this invention. It is a graph explaining the priority determination method by the priority determination means of the vehicle power control device which is one Embodiment of this invention. It is a graph explaining the determination value by the battery state detecting means of the electric power control device for a vehicle which is one Embodiment of this invention. It is a flowchart explaining the control operation of the electric power control device for a vehicle which is one Embodiment of this invention. It is a flowchart explaining the control operation in an emergency of the electric power control device for vehicles which is one Embodiment of this invention.

Hereinafter, the vehicle power control device 10 according to the embodiment of the present invention will be described in detail with reference to the drawings. In the description of the present embodiment, in principle, the same code number will be used for the same constituent member, and the repeated description will be omitted.

FIG. 1 is a block diagram showing an outline of the vehicle power control device 10 of the present embodiment.

As shown in FIG. 1, the vehicle power control device 10 mainly includes a power supply control unit 11, a battery 12, a battery sensor 13, a plurality of loads 14 to 21, and a plurality of load control units 22 to 29. The illuminance sensor 30, the room temperature sensor 31, the outside temperature sensor 32, the operation switches 33 for operating the on and off operations of the plurality of loads 17 to 21, the vehicle speed sensor 34, the camera 35, and the radar 36. , Is equipped. Further, the power supply control unit 11 includes, for example, a threshold value calculation means 11A, a priority determination means 11B, a storage means 11C, a power control means 11D, a battery state detection means 11E, and a surrounding environment recognition means 11F. ing.

The loads 14 to 16 are mainly electronic control devices for controlling the running, stopping or steering of the vehicle. For example, the load 14 is an electronic stability control device, the load 15 is an electric brake, and the load 16 is an electric brake. It is an electric power steering. On the other hand, the loads 17 to 21 are mainly electronic control devices that realize the comfort of the occupants of the vehicle. For example, the load 17 is an air conditioner, the load 18 is a steering heater, and the load 19 is. , The seat heater, the load 20 is an outdoor light, and the load 21 is an interior light.

The loads 14 to 16 belong to the first group which is not restricted by the electric power control means 11D, and the loads 17 to 21 restrict the electric power supply by the electric power control means 11D according to the traveling condition of the vehicle and the like. It belongs to the second group where receiving or power supply is stopped. The loads belonging to the first group and the second group are not limited to the above loads 14 to 21, and for example, the first group includes an airbag device, a collision damage mitigation braking device, and the like as other loads. , An audio device or the like may belong to the second group as another load. Further, the load distribution to the first group and the second group can be arbitrarily changed in design according to the traveling area of the vehicle and the like.

The power supply control unit 11 is configured to include a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and is an electronic control unit (which executes various calculations for vehicle control). ECU).

The threshold value calculation means 11A of the power supply control unit 11 has an operating time for each operation of the vehicles of the loads 17 to 21 belonging to the second group via the illuminance sensor 30, the room temperature sensor 31, the operation switch 33, etc. while the vehicle is running. Is measured, and after the occupant purchases the vehicle, the accumulated operating time from the time when the vehicle is first operated is stored in the storage means 11C, and the accumulated operating time is used to store the respective loads 17 to 21. The threshold value is calculated and stored in the storage means 11C.

Although the details will be described later, for example, in the case of the load 17 which is an air conditioner, the threshold value calculation means 11A measures the temperature inside the vehicle interior via the room temperature sensor 31, and each temperature range (16 ° C. to 18 ° C. as an example). The cumulative operating time of the load 17 in the temperature zone divided by 2 ° C. such as ° C.) is integrated and stored in the storage means 11C. Then, the threshold value calculation means 11A sets the median value of the temperature zone having the longest cumulative time as a threshold value and stores it in the storage means 11C.

The priority determination means 11B of the power supply control unit 11 is currently operating through an illuminance sensor 30, a room temperature sensor 31, an operation switch 33, etc. for each load 17 to 21 belonging to the second group during operation such as traveling of a vehicle. The running state of the vehicle, the state inside the vehicle, and the like are measured, and the measured values are stored in the storage means 11C. Then, the priority determination means 11B sets the priority of each load 17 to 21 by comparing the current measured value with the latest threshold value stored in the storage means 11C for each load 17 to 21. judge.

For example, in the case of the load 17 which is an air conditioner, the priority determination means 11B measures the current temperature in the vehicle interior via the room temperature sensor 31 and compares it with the latest threshold value of the load 17 stored in the storage means 11C. do. Then, in the summer, when the temperature inside the vehicle interior is lower than the latest threshold value, the priority of the load 17 is determined to be low. On the other hand, when the temperature inside the vehicle interior is higher than the latest threshold value, the priority of the load 17 is determined to be high. The higher level corresponds to the first level described in the claims, and the lower level corresponds to the second level described in the claims.

The storage means 11C of the power supply control unit 11 is composed of, for example, a non-volatile memory such as an EEPROM (Electrically Erasable Read-only Memory), and various data necessary for controlling the vehicle are stored. Then, as an example of the various data, the accumulated operating time of the loads 17 to 21, the updated threshold value, the current measured value, and the like are stored.

The power control means 11D of the power control unit 11 adjusts the supply of power to the loads 17 to 21 belonging to the second group according to the priority stored in the storage means 11C. Specifically, load control units 25 to 29 are arranged between the power supply control unit 11 and the loads 17 to 21, respectively. Then, the power control means 11D adjusts the supply of electric power to the loads 17 to 21 by controlling the load control units 25 to 29.

For example, the load control units 25 to 29 can be controlled by the power control means 11D to change the duty ratios of the loads 17 to 21 of the second group according to the priority of the loads 17 to 21 to the loads 17 to 21. Adjust the power supply. When each load control unit 25 to 29 has a relay, the load control unit 25 to 29 stops the supply of electric power to each load 17 to 21 by switching the relay to the off state. You can also. The load control units 22 to 24 are also arranged between the power supply control unit 11 and the loads 14 to 16, respectively.

The battery state detecting means 11E of the power supply control unit 11 measures the state of the battery 12 such as the remaining capacity, voltage, ambient temperature, internal resistance, and current of the battery 12 via the battery sensor 13, and stores the measured values in the storage means 11C. To memorize. Then, the battery state detecting means 11E measures, for example, the state of the battery 12 when the engine is operating and the state of the battery 12 when the idling stop system (hereinafter, referred to as “ISS”) is installed in the vehicle equipped with the idling stop system (hereinafter referred to as “ISS”). Then, it is stored in the storage means 11C.

The peripheral environment recognizing means 11F of the power supply control unit 11 recognizes the traveling environment around the own vehicle via the vehicle speed sensor 34, the camera 35 installed in front of or behind the own vehicle, the radar 36, and the like. Although the details will be described later, when the surrounding environment recognition means 11F recognizes the possibility of a collision of the own vehicle and activates the pre-crash warning, the load control units 25 to 29 are controlled by the power control means 11D. By stopping the supply of electric power to the loads 17 to 21 of the second group and concentrating on the supply of electric power to the loads 14 to 16 of the first group, in order to more reliably avoid the danger of collision of the own vehicle. Corresponds to. The camera 35 arranged in front of the own vehicle is, for example, a stereo camera provided in the upper part near the windshield in the interior of the own vehicle. Further, the radar 36 is, for example, a millimeter wave radar.

Next, FIG. 2 is a flowchart illustrating an example of a control operation of the threshold value calculation means 11A of the vehicle power control device 10 of the present embodiment. 3A and 3B are graphs illustrating a method of calculating a threshold value by the threshold value calculation means 11A of the vehicle power control device 10 of the present embodiment.

FIG. 2 shows an example of a control operation in which the threshold value calculation means 11A calculates the threshold value of the load 17 which is an air conditioner.

In step S10, when a occupant such as a driver gets on the vehicle and the occupant turns on the ignition, the power supply control unit 11 controls the battery 12, the load control units 22 to 29, and the like, and each load 14 of the vehicle is appropriately controlled. Start supplying power to ~ 21.

In step S11, the threshold value calculation means 11A of the power supply control unit 11 detects whether or not there are loads 14 to 21 that are currently on. Then, in YES of step S11, when the operation switch 33 for operating the load 17 is in the ON state and the threshold value calculation means 11A detects the ON operation of the load 17, in step S12, the threshold value calculation means 11A sets the threshold value calculation means 11A. The initial temperature inside the vehicle interior is measured via the room temperature sensor 31, and the measured value is stored in the storage means 11C. At this time, the threshold value calculation means 11A may measure the initial temperature outside the vehicle interior via the outside air temperature sensor 32 and store the measured value in the storage means 11C. If the threshold value calculation means 11A does not detect the on-operation of the load 17 in NO in step S11, the operation of detecting the on-operation of the load 17 is periodically repeated until the on-operation of the load 17 is detected.

In step S13, the threshold value calculating means 11A continuously measures the temperature inside the vehicle interior via the room temperature sensor 31, and stores the measured value in the storage means 11C. At this time, as shown in FIG. 3A, the threshold value calculating means 11A divides the temperature inside the vehicle interior into, for example, a range of 2 ° C., measures the operating time of the load 17 in each temperature zone, and measures the temperature. The value is stored in the storage means 11C. Then, as shown in the figure, the operating time by the latest measurement is accumulated and integrated with the operating time measured and stored in the past. In FIG. 3A, the horizontal axis shows the cumulative operating time (h) of the load 17, and the vertical axis shows the vehicle interior temperature (° C.).

In step S14, the threshold value calculation means 11A integrates the cumulative operating time in each temperature zone, calculates the median value of the temperature zone having the longest operating time as a threshold value, and stores it in the storage means 11C. For example, as shown in the figure, the threshold value calculation means 11A calculates the cumulative operating time in the temperature range of 16 ° C. to 18 ° C. as the longest in about 160 hours, with 17 ° C., which is the median value of the temperature range, as the threshold value. do.

In YES in step S15, when the operation switch 33 for operating the load 17 is in the off state and the threshold value calculation means 11A detects the off operation of the load 17, the work of calculating the threshold value of the load 17 ends. After that, the process returns to step S11, and the threshold value calculation means 11A of the power supply control unit 11 again detects whether or not there are loads 14 to 21 currently on.

On the other hand, if the threshold value calculation means 11A does not detect the off operation of the load 17 in the NO of step S15, the process returns to step S12, and the work of calculating the threshold value of the load 17 is performed again to obtain the latest threshold value and the load. The accumulated operating time of 17 is stored in the storage means 11C.

The occupant turns off the ignition at any timing in steps S11 to S15 described above to stop the supply of electric power to the loads 14 to 21 of the vehicle, and the threshold value calculating means 11A and the like described above. Then, the operating time and the like are stored in the storage means 11C, and the calculation of the threshold value is completed.

As described above, the method of calculating the threshold value by the threshold value calculation means 11A is not limited to the case where the cumulative operating time is used. FIG. 3B shows a method of calculating the threshold value of the load 19 which is a seat heater. In FIG. 3B, the horizontal axis shows the operating ratio (%) of the load 19 per unit time, and the vertical axis shows the vehicle interior temperature (° C.). As shown in the figure, the lower the vehicle interior temperature, the higher the operating ratio of the load 19, and the higher the vehicle interior temperature, the lower the operating ratio of the load 19. Then, the threshold value calculation means 11A calculates, for example, using 9 ° C., which is the median value of the temperature range of 8 ° C. to 10 ° C., at which the operating ratio is about 75%, as the threshold value. The operating ratio for which the threshold value is set can be arbitrarily changed in consideration of the traveling area of the vehicle and the like.

Although the method of calculating the threshold value in the case of the load 17 has been described with reference to FIG. 2, the threshold value is calculated by the same control operation for the other loads 18 to 21 belonging to the second group and stored in the storage means 11C. Will be done. At this time, the room temperature sensor 31 is used for the loads 17 to 19, and the illuminance sensor 30 is used for the loads 20 to 21.

As described above, the threshold value calculation means 11A can calculate the threshold value according to the request of the occupant by calculating each threshold value by using the accumulated operating time and the operating ratio of each load 17 to 21. For example, depending on the occupant, the on state of the air conditioner and the automatic state of the outdoor light may be maintained at all times. It is possible to calculate a threshold value that reflects the needs of the occupants.

Next, FIG. 4 is an image diagram illustrating a determination method of the priority determination means 11B of the vehicle power control device 10 of the present embodiment.

In FIG. 4, for example, in the case of a load 17 which is an air conditioner, the relationship between the threshold value and the vehicle interior temperature is shown, the operating time (seconds) of the load is shown on the horizontal axis, and the vehicle interior temperature of the vehicle is shown on the vertical axis. (° C) is shown. As shown, the straight line 41 indicates the threshold of the load 17, which is 17 ° C. as described above with reference to FIG. 3 (A). On the other hand, the curve 42 shows the temperature inside the vehicle, which rises with the passage of operating time after the start of measurement, and then changes in the vertical direction with a threshold value in between.

Then, FIG. 4 shows a region where the air conditioner as the load 17 is used as heating, and the region where the temperature is lower than the threshold value indicated by the sand-like hatching is determined by the priority determining means 11B as having a higher priority. .. That is, the priority determination means 11B measures the vehicle interior temperature via the room temperature sensor 31, compares the measured value with the above threshold value, and when the vehicle interior temperature is lower than the threshold value of 17 ° C., The priority of the load 17 is determined as high, and when the temperature is 17 ° C. or higher, the priority of the load 17 is determined as low.

In the priority determination means 11B, the load 18 and the load 19 used as the heating function are also determined in the same manner as the load 17 for heating. On the other hand, in the case of the load 17 for cooling, contrary to the above explanation, when the vehicle interior temperature is higher than the threshold value of 17 ° C., the priority of the load 17 is determined as high and 17 ° C. or lower. In the case of, the priority of the load 17 is determined to be low.

Further, in the load 20 which is an outdoor light and the load 21 which is an indoor light, the threshold value calculation means 11A is measured via the illuminance sensor 30, as in the case described above using FIG. 3A, for example, a number. The operating hours of the loads 20 and 21, respectively, are accumulated and integrated with respect to the illuminance levels divided into stages, and the threshold value is calculated using the accumulated operating hours. Then, the priority determination means 11B compares the current measured value measured via the illuminance sensor 30 with the threshold value, and determines the priority of the loads 20 and 21.

Next, FIG. 5 is a graph for explaining the determination value of the battery state detecting means 11E of the vehicle power control device 10 of the present embodiment.

As shown in the figure, the upper graph shows the transition of the current consumption (A) while the vehicle is running, and the lower graph corresponds to the upper graph and shows the voltage of the battery 12. In the upper graph, the area 51 indicated by the shaded hatching is the constant load current consumption used to maintain the ignition-on state of the vehicle, and the area 52 indicated by the sandy hatching is , The current consumption of the loads 17 to 21 belonging to the second group, and the region 53 shown in white is the current consumption of the loads 14 to 16 belonging to the first group.

On the left side of the upper graph, as shown in regions 51 and 53, the state in which power is supplied to the constant load and the loads 14 to 16 of the first group is shown, and at the timing shown by the alternate long and short dash line 54. The current consumption is the maximum. Then, at the maximum timing of the current consumption, the voltage of the battery 12 is about 12 V, and the load control units 22 to 24 for adjusting the power supply to the loads 14 to 16 of the first group are completely stopped. It is a level that does not reach.

On the other hand, on the right side of the upper graph, as shown in regions 51 to 53, when power is supplied to the constant load, the loads 17 to 21 of the second group, and the loads 14 to 16 of the first group. The current consumption is maximized at the timing indicated by the alternate long and short dash line 55. Then, at the maximum timing of the above current consumption, the voltage of the battery 12 is about 9.5 V, and there is a possibility that sufficient voltage cannot be supplied to the load control units 22 to 24 of the first group, depending on the situation. Then, the load control units 22 to 24 are completely stopped, which is a level at which a problem may occur in the running of the vehicle.

From the above, in the battery state detecting means 11E, for example, as shown by the alternate long and short dash line 56, 11.5V is set as the first determination value as the voltage of the battery 12, and the battery state detecting means 11E sets the first determination value. Upon detection, determination of adjustment of power supply to the loads 17 to 21 of the second group is started via the load control units 25 to 29. Further, in the battery state detecting means 11E, for example, as shown by the alternate long and short dash line 57, 10 V is set as the second determination value as the voltage of the battery 12, and the battery state detecting means 11E detects the second determination value. Then, the determination to stop the supply of electric power to the loads 17 to 21 of the second group via the load control units 25 to 29 is started.

That is, the battery state detecting means 11E adjusts the power supply to the loads 17 to 21 of the second group via the load control units 25 to 29 in two stages of the first and second determination values. This prevents the vehicle from being out of control due to insufficient power supply to the loads 14 to 16 of the first group, for example, the auxiliary power of the electric power steering and the electric brake is lost, and realizes safe driving of the vehicle. can do.

Next, FIG. 6 is a flowchart illustrating the control operation of the vehicle power control device 10 of the present embodiment.

In step S20, when a occupant such as a driver gets on the vehicle and the occupant turns on the ignition, the power supply control unit 11 controls the battery 12, the load control units 22 to 29, and the like, and each load 14 of the vehicle is appropriately controlled. Start supplying power to ~ 21.

In step S21, the battery state detecting means 11E detects the current battery state via the battery sensor 13. Then, in YES of step S22, when the battery state detecting means 11E detects that the voltage of the battery 12 is lower than the first determination value, in step S23, the priority determining means 11B stores. The latest thresholds of the respective loads 17 to 21 belonging to the second group are acquired from the means 11C.

In step S24, the priority determination means 11B measures the current illuminance level and the vehicle interior temperature for each load 17 to 21 via the illuminance sensor 30, the room temperature sensor 31, and the like, and stores the measured values in the storage means 11C. To memorize. Then, in step S25, the priority determination means 11B compares the current measured value with the latest threshold value acquired from the storage means 11C for each load 17 to 21, so that each load 17 to 21 is used. Determine each priority.

For the loads 17 to 21 whose priority is determined to be high in YES in step S26, the power control means 11D controls the load control units 25 to 29 in step S27 to maintain the power continuously supplied. do. On the other hand, with respect to the loads 17 to 21 whose priority is determined to be low in NO in step S26, the power control means 11D controls the load control units 25 to 29 and supplies the electric power in step S28. adjust.

In step S29, the battery state detecting means 11E again detects the current battery state via the battery sensor 13. Then, in YES of step S29, when the battery state detecting means 11E detects that the voltage of the battery 12 is lower than the second determination value, in step S30, the power control means 11D controls the load. The units 25 to 29 are controlled, and the power supplied to all the loads 17 to 21 belonging to the second group is stopped. If the battery state detecting means 11E detects in step S29 NO that the voltage of the battery 12 has recovered from the second determination value, the process returns to step S22 and the above-described control operation is repeated. ..

In step S31, when the battery state detecting means 11E detects that the voltage of the battery 12 has recovered from the second determination value, the process returns to step S29 and the above-described control operation is repeated.

By turning off the ignition at any timing in steps S21 to S31 described above, the occupant stops the supply of electric power to the loads 14 to 21 of the vehicle and ends the control operation described above. ..

As described above, in the priority determination means 11B of the vehicle power control device 10, the load of the second group is adjusted according to the traveling environment of the vehicle, for example, the air conditioning temperature in the vehicle interior, the seat temperature, the usage status of the outside light, and the like. The priority of 17 to 21 is determined, and the power supply to the loads 17 to 21 is adjusted as necessary according to the priority. Further, the vehicle power control device 10 adjusts the voltage of the battery 12 while adjusting the supply of electric power to the loads 17 to 21 by using the determination value of the battery 12 in at least two stages. According to this control method, the voltage of the battery 12 can be maintained within a range in which the vehicle can safely travel while operating the loads 17 to 21 as much as possible according to the request of the occupant.

Further, the threshold value calculation means 11A acquires the operating time of the loads 17 to 21 each time the vehicle travels, calculates a new threshold value, stores the new threshold value in the storage means 11C, and the priority determination means 11B uses the priority determination means 11B. The priority of the loads 17 to 21 is determined using the latest threshold value. According to this control method, it is necessary to adjust the power supply to the loads 17 to 21 according to the voltage of the battery 12, but the latest threshold value is a value that more reflects the occupant's request, and the occupant's satisfaction level. Can be met.

Next, FIG. 7 is a flowchart illustrating the control operation of the vehicle power control device 10 of the present embodiment, which is a control operation at the time of warning due to the pre-crash operation by the surrounding environment recognition means 11F. In the control operation of FIG. 7, the control operation described with reference to FIG. 6 is performed between steps S40 and S41. Is omitted.

In step S40, when a occupant such as a driver gets on the vehicle and the occupant turns on the ignition, the power supply control unit 11 controls the battery 12, the load control units 22 to 29, and the like, and each load 14 of the vehicle is appropriately controlled. Start supplying power to ~ 21.

In step S41, the surrounding environment recognizing means 11F uses the vehicle speed sensor 34, the camera 35, the radar 36, and the like to guide the surrounding environment of the own vehicle, for example, the distance between the vehicle and another vehicle and the presence of obstacles such as other vehicles and passersby. Etc. are recognized.

In step S42, the surrounding environment recognizing means 11F finds an obstacle such as another vehicle or a passerby having a possibility of collision in front of the own vehicle. Then, in YES of step S42, when the surrounding environment recognition means 11F determines that it may be difficult to avoid the obstacle and notifies the occupant of the warning by the pre-crash operation, step S43. The power control means 11D controls the load control units 25 to 29 and stops the power supplied to all the loads 17 to 21 belonging to the second group. If the surrounding environment recognition means 11F determines in step S42 NO that the obstacle can be avoided, the vehicle returns to step S41 without notifying the occupant of the warning by the pre-crash operation. , The control operation described above is repeated.

In step S44, the surrounding environment recognizing means 11F recognizes the avoidance of the collision of the own vehicle with the obstacle, and in step S45, the battery state detecting means 11E recovers the voltage of the battery 12 from the second determination value. When it is detected, in step S46, the power control means 11D controls the load control units 25 to 29, restarts the supply of power to the loads 17 to 21, and changes the operating state of the loads 17 to 21 to step S43. To return to the state before the full stop. After that, the process returns to step S41, and the above-mentioned control operation is repeated.

By turning off the ignition at any timing in steps S41 to S46 described above, the occupant stops the supply of electric power to the loads 14 to 21 of the vehicle and ends the control operation described above. ..

As described above, in the vehicle power control device 10, when the surrounding environment recognition means 11F recognizes the possibility of collision between the own vehicle and another vehicle and notifies a warning due to the pre-crash operation, the power control means 11D However, by stopping the power supplied to all the loads 17 to 21 belonging to the second group, it is possible to concentrate on supplying the power to all the loads 14 to 16 belonging to the first group. By this control method, it is possible to prevent the supply of electric power to the loads 14 to 16 from being insufficient due to the insufficient voltage of the battery 12 and the control of running, stopping or steering of the vehicle from being deteriorated, and to realize safe running of the vehicle. be able to.

In the present embodiment, the case where the vehicle runs on the engine has been described, but the present invention is not limited to this case. For example, when the vehicle is driven by a motor or when the vehicle is driven by an engine and a motor, such as EV (Electrical Vehicle), HEV (Hybrid Electric Vehicle), PHEV (Plug-in Hybrid Electrical Vehicle), etc. A similar effect can be obtained.

Further, the priority determination means 11B has described the case where the priorities of the loads 17 to 21 belonging to the second group are determined to be two levels, high and low, but the present invention is not limited to this case. For example, the priority of each load 17 to 21 belonging to the second group may be determined to be three levels of high, medium, and low, or may be determined to be four or more levels.

Further, the storage means 11C accumulates and stores the operating time of the load from the time when the occupant first operates the vehicle, and the threshold value calculating means 11A uses the accumulated operating time to obtain a threshold value for each operation. Although the case of calculating is described, the present invention is not limited to this case. For example, when the occupant moves and the driving environment of the vehicle changes, the accumulated operating time is reset once according to the request of the occupant, and the storage means 11C newly accumulates the operating time after the reset. The threshold value calculation means 11A may calculate the threshold value by using the new accumulated operating time.

Further, although the threshold value calculation means 11A has described the case where the threshold value common to each vehicle is calculated, the present invention is not limited to this case. For example, the threshold value calculation means 11A may calculate an individual threshold value for each driver and store it in the storage means 11C by using a face recognition system, a smart access key, or the like. Then, the priority determination means 11B may implement the control method described above by identifying the driver and using an individual threshold value for each driver. In addition, various modifications can be made without departing from the gist of the present invention.

10 Vehicle power control device 11 Power control unit 11A Threshold calculation means 11B Priority determination means 11C Storage means 11D Power control means 11E Battery status detection means 11F Surrounding environment recognition means 12 Battery 13 Battery sensors 14, 15, 16, 17, 18 , 19, 20, 21 Load 22, 23, 24, 25, 26, 27, 28, 29 Load control unit 30 Illumination sensor 31 Room temperature sensor 32 Outside temperature sensor 33 Operation switch 34 Vehicle speed sensor 35 Camera 36 Radar 51, 52, 53 region

Claims (9)

The battery installed in the vehicle and
A load mounted on the vehicle and operated by electric power supplied from the battery, and
A storage means for storing the operating time of the load and
Sensors that measure various conditions of the vehicle and
A threshold value calculation means that calculates the threshold value of the load using the operating time and stores the threshold value in the storage means.
A priority determination means for comparing the threshold value with the current measured value by the sensor and determining the priority for operating the load, and
A vehicle power control device comprising: a power control means for adjusting the power supplied to the load according to the priority. The storage means accumulates and stores the operating time for each operation of the vehicle, and stores the operating time.
The vehicle power control device according to claim 1, wherein the threshold value calculating means calculates the threshold value for each operation of the vehicle and stores the latest threshold value in the storage means. The load is divided into a first group that is not adjusted by the power control means and a second group that is adjusted by the power control means.
The priority determination means determines the priority of the load divided into the second group into at least a first level and a second level in which the power adjustment is performed prior to the first level. The vehicle electric power control device according to claim 1 or 2. Further, it has a battery state detecting means for detecting the charging state of the battery.
When the battery state detecting means detects that the voltage of the battery is lower than the first determination value, the power control means applies the load to the load determined to be the second level of the second group. The vehicle power control device according to claim 3, wherein the supply of electric power is stopped or limited. When the battery state detecting means detects that the voltage of the battery is lower than the second determination value lower than the first determination value, the power control means all the above in the second group. The vehicle power control device according to claim 4, wherein the supply of the power to the load is stopped. Further having a peripheral environment recognition means for recognizing the surrounding environment of the vehicle,
When the surrounding environment recognition means recognizes the danger of the vehicle and notifies the occupants of the vehicle of a warning, the power control means transfers the power to all the loads of the second group. The vehicle power control device according to any one of claims 3 to 5, wherein the supply is stopped. The sensor is a temperature sensor and
The vehicle power control device according to any one of claims 3 to 6, wherein the load included in the second group is an air conditioner, a steering heater, or a seat heater. The sensor is an illuminance sensor.
The vehicle power control device according to any one of claims 3 to 6, wherein the load included in the second group is an outdoor light or an interior light. The vehicle power control according to any one of claims 3 to 8, wherein the load included in the first group is a control device that controls traveling, stopping, or steering of the vehicle. Device.

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