JP2008087534A - Vehicular load control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular load control system capable of rapidly performing load control and avoiding a significant reduction in battery voltage. <P>SOLUTION: The vehicular load control system 100 comprises a load control unit 110 for performing the load control to avoid any abnormal power supply, and a load control means concentration unit 120 having a plurality of individual opening/closing means 121 to stop power supply to an electric load. The electric load related to the comfortableness of a user is classified into a first control object group 10 which is hardly recognized by the user, and a second control object group 20 which is easily recognized by the user. The load control means concentration unit 120 installs the individual opening/closing means 121 provided on a power supply line of the electric load in a concentrated manner. These individual opening/closing means 121 are all directly controlled from the load control unit 110. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle load control system, and more particularly to a vehicle load control system that controls power feeding from a battery to avoid power supply abnormality.

  In response to needs for higher performance and higher comfort of automobiles, vehicles are equipped with various on-board electric loads, and batteries for supplying electric power to these electric loads are provided. The power supply from the battery to each electric load is controlled by a vehicle load control system, and the battery state is also monitored here.

  In recent years, not only loads necessary for vehicle travel, such as an electrical load related to running performance and an electrical load related to safety, but also an electrical load for improving the comfort of drivers and passengers has increased. Due to such an increase in the in-vehicle electric load, the amount of power consumed from the battery is also increased. In some cases, the battery capacity is insufficient, and there is a possibility that the power cannot be supplied to an important load.

  In order to avoid such a situation where the power capacity is insufficient, research and development of a vehicle load control system has been conducted, and the battery capacity (SOC) or battery voltage (terminal voltage) is monitored, When there is a risk of capacity shortage, power supply to a less important load is stopped.

  As a conventional vehicle load control system, for example, in Patent Document 1, for each of a plurality of in-vehicle electric loads, a load control level having three or more stages indicating the priority of power supply as shown in FIG. The load control level is determined according to the decrease rate of the capacity or battery voltage. When the load determination level is changed, control such as stopping or reducing the supply of power to the load or returning the load is performed stepwise.

  Specifically, as shown in FIG. 9, the power supply control ECU 901 that controls the power supply from the battery determines the load control level based on the battery voltage 902, the SOH 903, the outside air temperature 904, and the like, and based on the load control level, A load control command is transmitted to ECU 905 (air conditioner ECU 905-1, seat ECU 905-2, etc.) that controls the load, and each ECU 905 stops or reduces power supply to the target load.

Further, in Patent Document 1, when the SOC or the battery voltage is greatly reduced in a situation where the operation of the electric load frequently and excessively changes, for example, the electric load that requires a large amount of electric power operates at the same time, By switching the load control level when it is determined that the state has continued for a predetermined time or more, it is possible to suppress an excessive change in the operating state of the electrical load.
JP 2005-318730 A

  However, the conventional vehicle load control system has the following problems. In Patent Document 1, a power control ECU 901 determines a load control level. When this level is switched, a load control command is transmitted to a lower-level ECU 905 such as an air conditioner ECU 905-1, and each ECU 905 has a predetermined load (such as an air conditioner load A). The power supply was controlled. For this reason, there is a problem that a time lag occurs after the power supply control ECU 901 detects a decrease in SOC or a decrease in battery voltage until the power supply to the load is controlled, and load control cannot be performed at high speed.

  Further, in Patent Document 1, even when the operation of the electric load changes frequently and excessively and the SOC or voltage of the battery changes drastically, load control is performed until it is determined that the state has continued for a predetermined time or more. By avoiding this, an excessive change in the operating state of the electrical load is suppressed. For this reason, when a load that instantaneously requires a large amount of power (starting current, electric power steering stationary, etc.) operates, the battery voltage drops significantly, causing a malfunction in the electrical load (flashing lamps, audio sound, etc.) There was a problem that a jump or the like) occurred.

  In particular, when the battery voltage is greatly reduced, there is a risk that the voltage will become lower than the minimum operating voltage of each ECU. In this case, each ECU 905 operates even if the power control ECU 901 transmits a load control command to each ECU 905. The load control cannot be performed. In order to avoid such a situation, it is possible to provide a stabilized power supply circuit (a booster circuit, a capacitor, etc.) so that the minimum operating voltage of the ECU can be maintained, but there is a problem that the cost increases.

  Furthermore, when a plurality of electric loads that require large electric power are operated simultaneously, a larger instantaneous current is required, which may further increase the battery voltage drop. Then, it was difficult to avoid such a large voltage drop of the battery.

  Accordingly, the present invention has been made to solve these problems, and an object of the present invention is to provide a vehicle load control system capable of performing load control at high speed and avoiding a significant decrease in battery voltage.

  A first aspect of a vehicle load control system according to the present invention is a vehicle load control system that controls electric power supplied from a battery to an electric load mounted on the vehicle, and relates to comfort of a user of the vehicle. The electric load of the first control target group that is difficult for the user to notice even if the power supply is stopped during operation, and the electric load of the second control target group that is noticed by the user when the power supply is stopped. A load control means concentrating unit in which individual open / close means for opening and closing power supply lines to the electric loads of the first control target group and the second control target group are mounted in a concentrated manner, and the battery of the battery The capacity or battery voltage is monitored, and when it is determined that the battery capacity or the battery voltage has dropped below a predetermined threshold, the individual opening / closing means is controlled to open. Characterized in that it comprises a load control unit.

  According to another aspect of the vehicle load control system of the present invention, the load control unit determines that a power supply abnormality is detected when the battery capacity or the battery voltage falls below the threshold, and the first abnormality A storage unit that stores in advance a power supply stop priority that defines the order in which power supply is stopped for each of the electrical loads of the control target group and the second control target group, and the power supply abnormality determination unit detects the power supply abnormality. A power supply control unit configured to open-control the individual opening / closing means according to the power supply stop priority input from the storage unit.

  In another aspect of the vehicle load control system of the present invention, the power supply stop priority gives priority to power supply stop of the electric load of the first control target group, and all the electric loads of the first control target group It is stipulated that the power supply stop of the electric load of the second control target group is performed after the power supply stop is performed.

  According to another aspect of the vehicle load control system of the present invention, the load control unit further determines whether or not the electric loads of the first control target group and the second control target group are operating. An intermediate load monitoring unit, and the power supply control unit has priority on power supply stoppage among the electric loads determined to be operating by the operating load monitoring unit when the power supply abnormality determination unit determines the power supply abnormality The individual opening / closing means is controlled to open in order from the highest degree.

  In another aspect of the vehicle load control system of the present invention, the load control unit further includes the electric load in which the individual opening / closing means is open-controlled when the power supply abnormality determination unit determines that the power supply abnormality is not present. A power supply restart load determining unit that determines whether power supply can be restarted, and the storage unit, together with the power supply stop priority, individual consumption of the electric load of each of the first control target group and the second control target group Can the power amount be stored, and the power supply restart load determination unit can restart power supply in order from the power supply stop priority in descending order based on the power supply stop priority and the individual power consumption input from the storage unit. The power supply control unit closes the individual opening / closing means connected to the electric load capable of resuming the power supply input from the power supply resumption load determination unit.

  In another aspect of the vehicle load control system according to the present invention, the load control unit further includes a high power load operation detection unit that detects an operation start of a large power load having a large inrush current, and the storage unit includes the power supply When the individual power consumption of the electric load of each of the first control target group and the second control target group is stored together with the stop priority, and the operation start of the high power load is detected by the high power load operation detection unit The power supply control unit integrates the individual power consumption of the electric load in the order of the power supply stop priority, and the individual opening / closing connected to the electric load until it becomes equal to or greater than the required power amount of the large power load. The means is controlled to be opened.

  According to another aspect of the vehicle load control system of the present invention, the load control unit further calculates a power shortage for estimating a power shortage when the high power load detected by the high power load operation detection unit is operated. And when the operation start of the high power load is detected by the high power load operation detection unit, the power supply control unit integrates the individual power consumption amounts of the electric loads in the order of the power supply stop priority. The individual opening / closing means connected to the electric load is controlled to open until the amount of power shortage estimated by the power shortage calculator is equal to or greater than the amount of power shortage.

  According to another aspect of the vehicle load control system of the present invention, the load control unit further determines whether or not the electric loads of the first control target group and the second control target group are operating. An intermediate load monitoring unit is provided, and the power supply control unit is configured to ensure that electric power equal to or greater than the necessary power amount or the insufficient power amount is secured for the electrical load determined to be operating by the operating load monitoring unit. The individual opening / closing means is controlled to open in descending order of power supply stop priority.

  In another aspect of the vehicle load control system according to the present invention, the load control unit further includes an operation delay control unit, and the high power load operation detection unit determines that there are two or more high power loads that have started operation. Then, the operation delay control unit shifts the operation start timing of the high power load by a predetermined time based on a predetermined priority determination criterion.

  Another aspect of the vehicle load control system according to the present invention is provided upstream of the load control means concentration unit, and supplies power to all the electric loads of the first control target group and the second control target group. When the power supply abnormality determination unit determines that the battery capacity or the battery voltage has dropped below a batch cutoff threshold that is lower than the threshold, the power supply control unit performs batch shutdown. When the command is output and the power supply control unit inputs the collective cut-off command from the power supply abnormality determination unit, the collective cut-off means is controlled to open.

  According to the vehicle load control system of the present invention, the electric load opening / closing means related to the comfort of the vehicle user is centrally installed and directly controlled when a power supply abnormality is detected. It becomes possible to perform load control in real time when an abnormality occurs.

  A vehicle load control system according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. In addition, about each structural part which has the same function, the same code | symbol is attached | subjected and shown for simplification of illustration and description.

  The vehicle load control system according to the present invention, when detecting a power supply abnormality in which the capacity or voltage of the battery has decreased below a predetermined threshold, causes power supply to be stopped at high speed for an electrical load that does not affect the safe driving of the vehicle. I am doing so. That is, as load control for avoiding battery power supply abnormality, only the electric load related to the comfort of the vehicle user is targeted, and the electric load related to running, safety and security of the vehicle is excluded.

  Electric loads related to user comfort include air conditioning systems, heater systems, lighting systems, etc., but these electrical loads may be noticed immediately by the user even when stopped during operation, or may be immediately noticed. . There are heater systems such as a rear defogger and a seat heater that are difficult for the user to notice even when stopped. On the other hand, there are an air-conditioning system such as a blower fan motor and a lighting system such as a front fog lamp that are immediately noticed by the user.

  In the vehicle load control system of the present invention, when the electric load related to the user's comfort is stopped in order to avoid the power supply abnormality of the battery, the electric load that is difficult for the user to notice is stopped. Then, when sufficient electric power cannot be secured by stopping all electric loads that are difficult for the user to notice, the electric load noticed by the user is also stopped.

  A vehicle load control system according to a first embodiment of the present invention will be described with reference to the block diagram shown in FIG. In FIG. 1, the in-vehicle electric loads supplied with power from the battery 1 are classified into a first control target group 10, a second control target group 20, a high power load group 30, and a non-control target load 40.

  The first control target group 10 and the second control target group 20 are the electric loads related to the user's comfort described above, and the electric load group that is difficult for the user to notice and the electric load group that the user notices immediately, respectively. It corresponds. In addition, the high power load group 30 includes a plurality of devices such as an electric power steering and an electric stabilizer. The non-control target load 40 includes an electronic control brake, an engine system, and the like, and these must always be maintained operable.

  The vehicle load control system 100 of this embodiment includes a load control unit 110 that performs load control for avoiding power supply abnormality, and a load control unit that includes a plurality of individual opening / closing means 121 for stopping power supply to an electrical load. And a concentrating unit 120. The load control means concentrating unit 120 concentrates all of the individual opening / closing means 121 provided on the respective power supply lines of the electric load 11 of the first control target group 10 and the electric load 21 of the second control target group 20 that are control targets. Installed. All of the individual opening / closing means 121 are directly controlled from the load control unit 110.

  An application example of the vehicle load control system 100 of the present embodiment is shown in FIG. A power supply line from the battery 1 is connected to a power supply line to each electric load in the junction box 151. The main loads connected by the junction box 151 include a load control means concentrating unit 120, an electric load 31 such as an electric power steering of the high power load group 30, an electric load 40 not subject to load control such as an electronic control brake, and the like. There is another junction box.

  The load control means concentrating unit 120 is provided with individual opening / closing means 121 on the power supply line to each electric load to be controlled by the vehicle load control system 100 of the present embodiment, and the individual opening / closing means 121 is installed in a concentrated manner. It is a thing. As the electric loads to be controlled, the electric loads 11 (rear defogger, etc.) of the first control target group 10 that are difficult for the user to notice even when the power supply is stopped, and the electric loads of the second control target group 20 that the user notices when stopped. 21 (blower fan motor or the like), and these are connected to the load control means concentration unit 120.

  Further, a power management ECU 152 for controlling power supply from the battery 1 is provided, which is connected to an ECU provided for each electric load or each group of electric loads through a multiplex communication line 153 and is connected to each ECU. The conventional function to perform control commands and state monitoring is provided. The load control unit 110 of the present embodiment may be configured to be processed by the power management ECU 152 together with the above-described conventional functions.

  In order to suppress as much as possible the time lag from the occurrence of a power supply abnormality to the start of load control, the load control unit 110 controls all the electric power of the first control target group 10 and the second control target group 20 that are load control targets. Load control for the load is performed directly. In order to perform this load control at high speed, the load control unit 110 is preferably processed by the power management ECU 152 that monitors the battery 1.

  The power management ECU 152 may be directly connected to the load control means concentrating unit 120 without using the multiplex communication line 153 so that the individual opening / closing means 121 can be directly controlled by a command from the load control unit 110. As a result, the time lag from when the load control command is actually controlled to when the individual opening / closing means 121 is actually controlled can be shortened as much as possible, and the reliability of load control can be improved without using the multiplex communication line 153. It is done.

  The load control means concentrating unit 120 concentrates the individual opening / closing means 121 (relays, etc.) provided in the power supply path of the electric loads 11 and 21 to be controlled in one place, for example, with one junction box. Can be configured. Alternatively, all the individual opening / closing means 121 may be concentrated in the junction box in which the power management ECU including the load control unit 110 is accommodated. The individual opening / closing means 121 is provided in the middle of the power supply line from the battery 1 to each electric load 11, 21 to be controlled, and has a function of turning on / off the power supply to each electric load, for example, a mechanical relay Alternatively, a semiconductor can be used.

  As described above, by causing the power management ECU 152 that monitors the battery 1 to also process the load control unit 110, each ECU (air conditioner ECU) that is a normal control device for the electric loads 11 and 21 to be controlled. Exchange of signals with the seat ECU, etc.) can be omitted, and the time lag from when the power supply abnormality of the battery 1 is detected to when the control of the electric loads 11 and 21 to be controlled is started is made as small as possible. be able to. Moreover, since there is no exchange with other ECUs via the communication line, more reliable load control can be realized.

  The configuration of the load control unit 110 will be described in more detail. The load control unit 110 of the present embodiment includes a power supply abnormality determination unit 111, a power supply control unit 112, a storage unit 113, a high power load operation detection unit 114, and an insufficient power determination unit 115.

  The power supply abnormality determination unit 111 receives state signals such as the current, voltage, and temperature of the battery 1 and obtains the battery capacity therefrom. Then, the battery capacity and the battery voltage are compared with respective predetermined threshold values, and when at least one of them is equal to or less than the threshold value, it is determined that the power supply of the battery 1 is abnormal. When the power supply abnormality is determined, the power supply control unit 112 is instructed to perform predetermined load control. It should be noted that the determination of the power supply abnormality may be made only when either the battery capacity falls below a predetermined capacity threshold or when the battery voltage falls below the predetermined voltage threshold.

  Upon receiving a load control command from the power supply abnormality determination unit 111, the power supply control unit 112 controls the electric load to be controlled according to a predetermined processing procedure. First, the power supply control unit 112 inputs the power supply stop priority stored in the storage unit 113. The power supply stop priority defines the priority order for stopping power supply for each of the electric load 11 of the first control target group 10 and the electric load 21 of the second control target group 20 that are the control targets. As described above, the electric load 11 of the first control target group 01 that is difficult for the user to notice even when the power supply is stopped is preferentially stopped. And after carrying out the electric power supply stop of all the electric loads 11 of the 1st control object group 10, the electric power supply stop of the electric load 21 of the 2nd control object group 20 is performed.

  The power supply control unit 112 inputs the power supply stop priority from the storage unit 113 and stores the electrical load that has been stopped for power supply until then. Or you may make it memorize | store the electric load by which electric power supply was stopped in the memory | storage part 113, and input with an electric power supply stop priority. In accordance with the load control command from the power supply abnormality determination unit 111, the power supply control unit 112 selects the electric load with the highest power supply stop priority from among the electric loads to be controlled that have not stopped power supply. Then, a control command is output to open the individual opening / closing means 121 corresponding to the selected electrical load in the load control means concentration unit 120.

  The battery capacity and the battery voltage are recovered by stopping the power supply of the electric load targeted by the control from the power supply control unit 112. Thereafter, when the power supply abnormality determination unit 111 determines the power supply abnormality again, the power supply control unit 112 selects another electric load and controls the power supply stop. In this way, the power supply control unit 112 controls the power supply stop until the power supply abnormality determination unit 111 determines that the power supply abnormality is not detected.

  In the vehicle load control system 100 of the present embodiment configured as described above, both the power supply abnormality determination by the power supply abnormality determination unit 111 and the load control by the power supply control unit 112 are performed by the load control unit 110. Therefore, the processing speed is increased at the same time as the conventional load control system in which each process of power supply abnormality determination and load control is performed by a separate ECU and signal transmission therebetween is performed via a communication line. Reliability can be improved.

  Further, the individual opening / closing means 121 for stopping the power supply to the electrical loads 11 and 21 of the first control target group 10 and the second control target group 20 to be controlled is concentrated on the load control means concentration unit 120 and installed. By controlling the power supply directly from the power supply control unit 112, the time lag from the determination of the power supply abnormality by the power supply abnormality determination unit 111 until the power supply is actually stopped can be greatly reduced. In particular, the load control unit 110 and the load control means concentrating unit 120 are installed close to each other or integrated and mounted on one ECU, so that it is possible to realize further higher speed.

  The vehicle load control system 100 according to the present embodiment further includes a large power load operation detection unit 114 and an insufficient power determination unit 115. The electric load 31 of the high power load group 30 such as engine start and electric power steering requires instantaneous high power, and there is a possibility that the battery voltage will greatly decrease as the operation starts. As an example, FIG. 3 shows a voltage change of the battery 1 when the electric power steering is operated. In the figure, the discharge current 162 of the battery 1 is shown together with the change of the battery voltage 161. As shown in the figure, it can be seen that the battery voltage 161 and the discharge current 162 vary greatly with the operation of the electric power steering.

The battery voltage 161 and the discharge current 162 have a linear relationship as shown in FIG. FIG. 4 shows the relationship between the case where the battery 1 is new (symbol 163) and the case where the battery 1 has deteriorated to some extent (symbol 164). In both cases, the battery voltage 161 decreases as the discharge current 162 increases. Is shown. From this, when the large power load 31 is operated in a state where the amount of power supplied to the electric loads 11 and 21 of the first control target group 10 and the second control target group 20 is large, the battery voltage is greatly reduced to a predetermined threshold value. May fall below. Therefore, in the vehicle load control system 100 of the present embodiment, the electric loads 11 and 21 of the first control target group 10 and the second control target group 20 are stopped within an appropriate range before the large power load 31 is operated. I have to.

  The large power load operation detection unit 114 has a function of detecting in advance that the electric load 31 of the large power load group 30 operates. The large power load operation detection unit 114 can detect the operation start of each electric load 31 in advance by detecting a predetermined signal or the like. For example, the electric power steering is an operation flow in which the high-power load ECU 32 calculates the assist current and drives the motor based on the torque sensor information, so that the torque sensor signal is detected, and the engine start is detected by detecting the ST signal. It is possible to detect the start of operation. The high power load operation detection unit 114 detects the start of operation of each high power load by inputting such a torque sensor signal or ST signal.

  When the operation start of the large power load 31 is detected by the large power load operation detecting unit 114, the insufficient power determining unit 115 is executed next to estimate the amount of insufficient power when the large power load 31 is operated. The insufficient power determination unit 115 stores in advance the respective amounts of power necessary for the operation of the large power load 31, and obtains the allowable discharge capacity by inputting the current battery capacity from the power supply abnormality determination unit 111. Then, the insufficient power amount is calculated from the difference between the allowable discharge capacity and the power amount necessary for the operation of the large power load 31.

  The insufficient power determination unit 115 also receives the current battery voltage from the power supply abnormality determination unit 111. As the battery voltage increases as the discharge current increases, the amount of voltage drop increases, so the amount of voltage drop due to the operation of the large power load 31 is estimated, and the battery voltage after the operation of the large power load 31 is determined from this and the current battery voltage. Is estimated. When the estimated battery voltage is equal to or lower than a predetermined voltage threshold, a load reduction amount necessary to avoid this is estimated.

  The larger of the insufficient power amount and the load reduction amount obtained as described above is output to the power supply control unit 112 as the insufficient power amount. In addition to the above power supply stop priority, the storage unit 113 also stores the individual power consumption amounts of the electric loads 11 and 21 to be controlled. Then, when the insufficient power amount is input from the insufficient power determination unit 115 to the power supply control unit 112, the individual power consumption amounts are added in order of the power supply stop priority, and the electric load until this becomes equal to or greater than the insufficient power amount is calculated. select. In order to stop the power supply to the electrical load selected in this way, the power supply control unit 112 outputs a close control command to each opening / closing means 121.

  As described above, the operation start of the large power load 31 is detected in advance by the large power load operation detection unit 114, the amount of power that is insufficient due to the operation of the large power load 31 is estimated by the insufficient power determination unit 115, and the power supply control is further performed. By stopping the electric load 11 or / and 21 corresponding to the insufficient power amount by the control from the unit 112, the battery capacity and the battery voltage are prevented from falling below a predetermined threshold even when the large power load 31 is operated. Is possible.

  In the above embodiment, the shortage power determination unit 115 is used to estimate the shortage power amount when the large power load 31 is operated. However, another embodiment in which the shortage power determination unit 115 is not used is also possible. When the insufficient power determination unit 115 is not used, when the operation start of the large power load 31 is detected by the large power load operation detection unit 114, this is directly notified to the power supply control unit 112. The power supply control unit 112 stores in advance the amount of power necessary for the operation of each large power load 31 instead of the insufficient power determination unit 115. Alternatively, the required power amount of each large power load 31 may be stored in the storage unit 113, and this may be input and used.

  Upon receiving notification of the operation start of the large power load 31 from the large power load operation detection unit 114, the power supply control unit 112 obtains the amount of power necessary for the operation of the large power load 31 that has started operation, and in order of the power supply stop priority. The individual power consumptions of the electrical loads 11 and 21 to be controlled are added, and the electrical loads 11 and 21 are selected until this becomes equal to or greater than the required power amount of the large power load 31. In order to stop the power supply to the electrical load selected in this way, the power supply control unit 112 outputs a close control command to each opening / closing means 121.

  In the present embodiment, the required power amount of the high-power load 31 that starts operation is secured by stopping the operating electric loads 11 and 21. Thereby, even if the large power load 31 is operated, it is possible to avoid a shortage of battery capacity or an abnormal drop in battery voltage.

In the vehicle load control system 100 of the present embodiment, a collective opening / closing means 130 is further provided. The collective switching means 130 can collectively cut off the power supply to the load control means concentrating unit 120. For example, the battery voltage is lower than the collective cut-off threshold lower than the above threshold due to a failure of an alternator, a battery, or the like. In the case of a decrease in power, the power supply to all the electric loads 11 and 21 of the first control target group 10 and the second control target group 20 can be stopped collectively in order to prioritize the retreat travel.

  When the power supply abnormality determination unit 111 determines that the battery capacity or the battery voltage has decreased below the above-described batch cutoff threshold, it outputs a batch cutoff command to the power supply control unit 112. The power supply control unit 112 outputs an open command to the collective shut-off unit 130 when the collective shut-off command is input from the power supply abnormality determination unit 111. Thereby, the collective interruption means 130 is changed to the open state, and power supply to all the electric loads 11 and 21 of the first control target group 10 and the second control target group 20 is stopped.

  A vehicle load control system according to a second embodiment of the present invention will be described below with reference to FIG. In the vehicle load control system 200 of this embodiment, an operation delay control unit 216 is further added to the load control unit 110 to configure the load control unit 210. When it is determined by the high power load operation detection unit 214 that two or more large power loads 31 start operating simultaneously, the determined two or more large power loads 31 are notified to the operation delay control unit 216 together with the insufficient power determination unit 215. .

  The operation delay control unit 216 stores in advance the priority for each large power load 31 of the large power load group 30, and when two or more large power loads 31 are notified from the large power load operation detection unit 214, The operation start order of the large power load 31 is determined according to the priority. Then, a predetermined control command is output to the high power load ECU 32 that controls each large power load 31 so as to delay the large power loads 31 whose operations are to be started after the second time by a predetermined time.

  For example, when the electric power steering that is the large power load 31 and the electronic control brake operate simultaneously, the electronic control brake that is the safety system is preferentially operated, and the electric power steering operation is delayed by, for example, several hundred ms or more. In this way, it is possible to avoid an abnormal voltage drop by shifting the timing of the inrush current when the large power load 31 operates.

  On the other hand, when two or more large power loads 31 are notified, the shortage power determination unit 215 determines the large power load 31 having the largest amount of power required for the operation, and first sets the first large power load 31 as a target. The electrical loads 11 and 21 to stop feeding are selected in the same manner as in the embodiment. Similarly to the first embodiment, power supply abnormality can be avoided even when the large power load 31 is operated by opening control of the individual opening / closing means 121 of the electric loads 11 and 21 for stopping the power supply from the power supply control unit 112 as in the first embodiment. I am doing so.

  A vehicle load control system according to a third embodiment of the present invention will be described below with reference to FIG. In the vehicle load control system 300 according to the present embodiment, an in-operation load monitoring unit 317 is further added to the load control unit 110 according to the first embodiment to configure the load control unit 310.

  The operating load monitoring unit 317 receives a predetermined state signal from the lower ECU 50 that controls the electric loads 11 and 21 of the first control target group 10 and the second control target group 20, and based on this signal It is determined whether each electric load is in operation. The electric loads 11 and 21 determined to be operating are notified to the power supply control unit 312. When the power supply abnormality determination unit 111 determines that a power supply abnormality has occurred, the power supply control unit 312 targets the operating electrical loads 11 and 21 input from the operating load monitoring unit 317 and has a high power supply stop priority. The individual opening / closing means 121 are sequentially controlled to open.

  As described above, by adding the operating load monitoring unit 317, it is possible to immediately stop the operating electric load and reduce the discharge current from the battery 1. In the case of the first embodiment that does not include the operating load monitoring unit 317, the individual opening / closing means 121 is sequentially controlled to open until the power supply abnormality determination unit 111 does not determine the power supply abnormality in accordance with the order of the power supply stop priority. Will go.

  In the present embodiment, even when the operation start of the large power load 31 is detected by the large power load operation determining unit 114, the electric load that is determined to be operating by the operating load monitoring unit 317 in the power supply control unit 112 is targeted. In addition, the individual opening / closing means 121 can be controlled to open in order from the one with the highest power supply stop priority until the amount of power equal to or greater than the required power amount or the insufficient power amount is secured.

  A vehicle load control system according to a fourth embodiment of the present invention will be described below with reference to FIG. In the vehicle load control system 400 of the present embodiment, a load control unit 410 is configured by adding a power supply restart load determination unit 418 to the load control unit 110 of the first embodiment.

  The power supply restart load determination unit 418 determines whether power supply can be restarted for the electric load 11 or 21 whose individual switching means 121 is open when the power supply abnormality determination unit 111 determines that there is no power supply abnormality. is there. The power supply resumption load determination unit 418 inputs the power supply stop priority and the individual power consumption from the storage unit 113 and inputs the margin amount from which the battery capacity or the battery voltage exceeds a predetermined threshold from the power supply abnormality determination unit 111. . Then, in order from the lowest power supply stop priority, the individual power consumption amount and the margin amount are compared to determine whether power supply can be resumed.

  The electric load 11 or 21 determined to be able to resume power supply is notified to the power supply control unit 412, and the power supply control unit 412 controls the individual opening / closing means 121 connected to the electric load 11 or 21 to be closed. Thereby, when the discharge capacity of the battery 1 is sufficiently high, the individual opening / closing means 121 that has been controlled to open can be automatically returned to the closed state again.

  As described above, according to the vehicle load control system of the present invention, the electrical load opening / closing means 121 related to the comfort of the vehicle user is centrally installed, and this is directly controlled when a power supply abnormality is detected. By doing so, it becomes possible to perform load control in real time when the power supply is abnormal. Since the opening / closing means 121 is centrally mounted on the load control means concentration unit 120, it is possible to standardize functions and simplify control.

  Moreover, the load control at the time of a high power load operation can suppress a decrease in battery capacity and a significant decrease in battery voltage. In particular, when two or more large power loads operate simultaneously, the inrush current can be suppressed by performing load control so as to appropriately shift the operation time. Further, when it is necessary to give priority to the retreat travel due to a power supply abnormality, the power supply to the load control means concentration unit 120 can be collectively cut off by opening the collective opening / closing means 130.

  In addition, the description in this Embodiment shows an example of the vehicle load control system which concerns on this invention, and is not limited to this. The detailed configuration and detailed operation of the vehicle load control system in the present embodiment can be changed as appropriate without departing from the spirit of the present invention.

1 is a block diagram showing a vehicle load control system according to a first embodiment of the present invention. It is a figure showing an example of application of a load control system for vehicles concerning a 1st embodiment of the present invention. It is a figure which shows the change of the electric current and voltage of a battery when an electric power steering operate | moves. It is a graph which shows the relationship between a battery voltage and discharge current. It is a block diagram which shows the load control system for vehicles which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the load control system for vehicles which concerns on the 3rd Embodiment of this invention. It is a block diagram which shows the load control system for vehicles which concerns on the 4th Embodiment of this invention. It is a figure which shows the load control level used with the conventional vehicle load control system. It is a block diagram which shows the conventional vehicle load control system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery 10 1st control object group 11 Electric load of 1st control object group 20 2nd control object group 21 Electric load of 2nd control object group 30 High power load group 31 High power load 32 High power load ECU
40 Non-controllable load 50 Sub ECU
100, 200, 300, 400 Vehicle load control system 110, 210, 310, 410 Load control unit 111 Power supply abnormality determination unit 112, 312, 412 Power supply control unit 113 Storage unit 114, 214 High power load operation detection unit 115, 215 Underpower determination unit 120 Load control unit concentration unit 121 Individual switching unit 130 Collective switching unit 151 Junction box 152 Power management ECU
153 Multiplex communication line 161 Battery voltage 162 Discharge current 216 Operation delay control unit 317 Load monitor during operation 418 Power supply restart load determination unit 901 Power control ECU
902 Battery voltage 903 SOH
904 Outside temperature 905 ECU

Claims (10)

A vehicle load control system for controlling electric power supplied from a battery to an electric load mounted on a vehicle,
The electric load related to the comfort of the user of the vehicle is not noticeable even if the power supply is stopped during operation, and the user notices when the power supply is stopped. Load control classified into the electric loads of two control target groups, and centrally mounted with individual switching means for opening and closing power supply lines to the electric loads of the first control target group and the second control target group, respectively Means concentration section;
And a load control unit that monitors the battery capacity or the battery voltage of the battery and opens the individual opening / closing means when it is determined that the battery capacity or the battery voltage has dropped below a predetermined threshold. Load control system. The load control unit
A power supply abnormality determination unit that determines a power supply abnormality when the battery capacity or the battery voltage drops below the threshold;
A storage unit that stores in advance a power supply stop priority that defines the order in which power supply is stopped for each of the electric loads of the first control target group and the second control target group;
The power supply control part which opens the said individual opening / closing means according to the said power supply stop priority input from the said memory | storage part when the said power supply abnormality determination part determines with the said power supply abnormality determination, The power supply control part is provided. Vehicle load control system. The power supply stop priority gives priority to power supply stop of the electric load of the first control target group, and after the power supply stop of all the electric loads of the first control target group is performed, the second control target group The vehicle load control system according to claim 2, wherein the electric load is specified to be stopped. The load control unit further includes an operating load monitoring unit that determines whether or not the electric loads of the first control target group and the second control target group are operating,
When the power supply abnormality determination unit determines the power supply abnormality, the power supply control unit sequentially selects the electric loads that are determined to be operating by the operating load monitoring unit in descending order of the power supply stop priority. The vehicle load control system according to claim 2 or 3, wherein the individual opening / closing means is controlled to be opened. The load control unit further determines a power supply restart load determination unit that determines whether power supply can be resumed with respect to the electric load whose open / close control is open when the power supply abnormality determination unit determines that the power supply abnormality does not occur. With
The storage unit stores the individual power consumption amounts of the electric loads of the first control target group and the second control target group together with the power supply stop priority,
Based on the power supply stop priority and the individual power consumption input from the storage unit, the power supply restart load determination unit determines whether power supply can be restarted in order from the lowest power supply stop priority,
The power supply control unit closes the individual opening / closing means connected to the electric load capable of resuming the power supply input from the power supply resumption load determining unit. The vehicle load control system described. The load control unit further includes a high power load operation detection unit that detects the start of operation of a large power load with a large inrush current,
The storage unit stores the individual power consumption amounts of the electric loads of the first control target group and the second control target group together with the power supply stop priority,
When the operation start of the high power load is detected by the high power load operation detection unit, the power supply control unit integrates the individual power consumption of the electric load in the order of the power supply stop priority, and this is the high power load. 4. The vehicle load control system according to claim 2, wherein the individual opening / closing means connected to the electric load is controlled to be opened until the required electric energy becomes equal to or greater than the required power amount. The load control unit further includes an insufficient power calculation unit that estimates an amount of insufficient power when the large power load detected by the large power load operation detection unit operates.
When the operation start of the high power load is detected by the high power load operation detection unit, the power supply control unit integrates the individual power consumption of the electric load in the order of the power supply stop priority, and this calculates the insufficient power The vehicle load control system according to claim 6, wherein the individual opening / closing means connected to the electric load is controlled to open until the amount of insufficient electric power estimated by the unit becomes equal to or greater than the amount. The load control unit further includes an operating load monitoring unit that determines whether or not the electric loads of the first control target group and the second control target group are operating,
The power supply control unit has a high power supply stop priority until the electric load that is determined to be in operation by the operating load monitoring unit is secured for the electric power more than the required power amount or the insufficient electric power amount. The vehicle load control system according to claim 6 or 7, wherein the individual opening / closing means is controlled to be opened in order. The load control unit further includes an operation delay control unit,
When the high power load operation detection unit determines that there are two or more high power loads to start operation, the operation delay control unit determines the operation start timing of the high power load for each predetermined time based on a predetermined priority determination criterion. The vehicle load control system according to claim 6 or 7, wherein the vehicle load control system is shifted. Provided on the upstream side of the load control means concentration section, comprising a collective opening and closing means capable of collectively stopping power supply to all the electric loads of the first control target group and the second control target group,
When the power supply abnormality determining unit determines that the battery capacity or the battery voltage has decreased to a value equal to or lower than a collective interruption threshold value that is lower than the threshold value, the collective interruption instruction is output to the power supply control unit,
4. The vehicle load control system according to claim 2, wherein the power supply control unit opens the collective shut-off unit when the collective shut-off command is input from the power supply abnormality determination unit. 5.

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