JP6107142B2 - POWER CONTROL DEVICE, POWER MODEL UPDATE METHOD, PROGRAM, AND MEDIUM - Google Patents

Description

  The present invention relates to a power supply control device, a power supply model updating method, a program, and a medium that are suitable for use in low-voltage side batteries such as passenger cars, trucks, and buses.

  Electric vehicles, plug-in type hybrid vehicles, hybrid vehicles, and ordinary gasoline vehicles are equipped with a low-voltage battery and are mainly used as a power source for control. As a technique for detecting the deterioration of the battery, for example, as described in Patent Document 1, an OCV-SOC characteristic map is stored, and the measured OCV (Open Circuit Voltage) is used to determine the SOC (State Of Charge). ) To estimate the full charge capacity.

JP 2010-19664 A

  However, in the above-described prior art, when the battery is replaced or deteriorated, the characteristic of the battery after the characteristic change is unknown, so that the SOC cannot be estimated. That is, there has been a problem that it is not possible to appropriately detect the charge rate after the battery characteristic has changed.

  In view of the above problems, an object of the present invention is to provide a power supply control device, a power supply model update method, a program, and a medium that can appropriately detect a charge rate after a change in battery characteristics.

  In order to solve the above-described problem, a power supply control device according to the present invention includes a measurement unit that measures an open-end voltage of a vehicle battery, and a storage unit that stores a map indicating a relationship between the open-end voltage and the charging rate. A determination unit that determines whether or not a characteristic change factor of the battery has occurred, and a control unit that controls charging of the battery. When the determination unit determines affirmative, The battery is charged when the vehicle is parked, and the measuring means measures or estimates a first open-end voltage that is the open-end voltage when the charge rate of the battery is fully charged, and the first And a correction unit that corrects the map using an open-circuit voltage. Here, the control means discharges the battery by a predetermined amount from when the charging rate is fully charged, and the measurement means measures the second open-end voltage that is the open-end voltage after the discharge, and the measurement means The correction unit may correct the map using two open-ended voltages.

The power model update method according to the present invention includes a measurement step of measuring an open-end voltage of a battery of a vehicle, a storage step of storing a map indicating a relationship between the open-end voltage and a charging rate, and characteristics of the battery A determination step for determining whether or not a change factor has occurred; and a control step for controlling charging of the battery. When the determination step determines affirmative, the vehicle is parked in the control step. Sometimes the battery is charged, and in the measurement step, the first open-end voltage that is the open-end voltage when the charge rate of the battery is fully charged is measured or estimated, and the first open-end voltage is And a correction step of correcting the map. The program according to the present invention is a program Ru to execute the power model updating method in a computer, a recording medium according to the present invention is a computer-readable recording medium recording the program.

  According to the power supply control device and the power supply model update method of the present invention, when there is a battery characteristic change factor (battery clearing or replacement, deterioration due to elapse of a predetermined period, etc.) Is detected as the first open-circuit voltage, and the battery map can be updated. That is, the charging rate can be detected from the open-end voltage more appropriately using the updated map.

It is a schematic diagram which shows one Embodiment of the power supply control apparatus 1 of Example 1 which concerns on this invention. 3 is a flowchart illustrating control contents of the power supply control device 1 according to the first embodiment. It is a schematic diagram which shows the 1st update aspect of the map of the battery in the power supply control apparatus 1 of Example 1. FIG. It is a schematic diagram which shows one Embodiment of the power supply control apparatus 1 of Example 2 which concerns on this invention. It is a flowchart which shows the control content of the power supply control apparatus 1 of Example 2. FIG. It is a schematic diagram which shows the 2nd update aspect of the map of the battery in the power supply control apparatus 1 of Example 2. FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the power supply control device 1 of this embodiment includes a battery 2, a battery sensor 3, an ECU 4 (Electronic Control Unit), and a charging device 5. As shown by the solid line in FIG. 1, the control power generated by the battery 2 is supplied to one or more vehicle electrical devices 7 via the traveling IGSW 6 and also to the ECU 4 via the parking power SW 8. Similarly, control power is also supplied to the power supply SW control ECU 9 and the charging device 5 that collectively control the traveling IGSW 6 and the parking power supply SW8.

  The ECU 4 and the power supply SW control ECU 9 are connected to each other by an in-vehicle LAN of a communication standard such as CAN (Controller Area Network) as indicated by a broken line in FIG. The battery sensor 3 and the ECU 4 are connected to each other according to a communication standard such as LIN (Local Interconnect Network).

  The battery 2 is a low-voltage secondary battery such as a lead storage battery. The battery sensor 3 incorporates a microcomputer (not shown), and this microcomputer constitutes a measuring means 3a for measuring the open end voltage OCV and current A of the battery 2, and the open end voltage OCV and the charge rate SOC (State Of Charge). The storage means 3b for storing a map indicating the relationship with () is configured.

  The ECU 4 includes, for example, a CPU, a ROM, a RAM, a data bus that connects them to each other, and an input / output interface. The ECU 4 performs each control described below in accordance with a program stored in the ROM, and determines the determination means 4a. The control means 4b and the correction means 4c are configured.

  The charging device 5 is, for example, a DC / DC converter that converts the power of a high-voltage side battery (not shown) to charge the low-voltage battery 2. The power control SW control ECU 8 is also configured to include, for example, a CPU, a ROM, a RAM, a data bus that interconnects them, and an input / output interface, and performs each control described below in accordance with a program stored in the ROM. In the case of IGON, the traveling IGSW 6 is turned on, and in the case of IGOFF, the parking power supply SW8 is turned on.

  The determination unit 4a of the ECU 4 determines whether a characteristic change factor of the battery 2 has occurred. In the first embodiment, the determination unit 4a is configured such that the time change rate of the open-circuit voltage OCV acquired from the battery sensor 3 exceeds, for example, a certain threshold and decreases for a certain duration (battery clear, that is, removal of the battery 2 It is determined as affirmative as to whether or not a characteristic change factor has occurred when the battery 2 is replaced with a condition that can be regarded as having occurred and a condition in which a predetermined period for which deterioration is expected has elapsed after the battery 2 has been replaced.

  The control means 4b of the ECU 4 controls the charging of the battery 2 by driving the charging device 5. When the determination means 4a determines that the determination means 4a is affirmative, the control means 4b charges the battery 2 using the charging device 5 when the vehicle is parked, and the measurement means 3a has a fully charged SOC 2 of the battery 2. The first open-end voltage OCVa that is the open-end voltage OCV is estimated. An appropriate method can be used as the estimation method. For example, it is assumed that the increase in the charging rate SOC accompanying charging is linear with respect to the open-circuit voltage OCV or the charging time, and a certain time has elapsed after the start of charging. At the time, the open end voltage OCVa at the time of full charge is estimated.

  The correction means 4c of the ECU 4 outputs a first correction command including a first correction for correcting the map stored in the storage means 3b in the battery sensor 3 to the storage means 3b using the first open-circuit voltage OCVa. To do. When the storage means 3b receives the first correction command, as shown in FIG. 3, the map is offset by offsetting the map in the Y-axis direction indicating OCV so that the first open-ended voltage OCVa corresponds to the charging rate SOC at the time of full charge. To do.

  Hereinafter, the control content of the power supply control device 1 according to the first embodiment will be described with reference to the flowchart of FIG. As shown in step S1, the measurement unit 3a of the battery sensor 3 proceeds to step S2 while detecting the open-circuit voltage OCV and the current A, and in step S2, the determination unit 4a determines whether or not a characteristic change factor has occurred. I do. If the result is affirmative in step S2, the process proceeds to step S3. If the result is negative, the process proceeds to END.

  In step S3, the determination means 4a determines whether or not the ignition key of the vehicle is IGOFF and the vehicle is parked. If the result is affirmative, the process proceeds to step S4. If the result is negative, the process proceeds to END. .

  In step S4, the determination means 4a determines whether or not the charging start trigger is on (in this embodiment, whether or not the battery 2 is in a state suitable for charging after a predetermined time has elapsed since IGOFF), If the result is affirmative, the process proceeds to step S5. If the result is negative, the process proceeds to END.

  In step S5, the control unit 4b drives the charging device 5 to charge the battery 2, and the measuring unit 3a estimates the open-end voltage OCVa at the time of full charge by the above-described appropriate estimation method.

  In step S6, the correction unit 4c outputs a first correction command based on the open-circuit voltage OCVa estimated in step S5 to the storage unit 3b, and the storage unit 3b corrects the map based on the first correction command.

  According to the power supply control device 1 and the power supply model update method of the first embodiment described above, the following operational effects can be obtained. That is, each time a characteristic change factor of the battery 2 occurs, the map stored in the storage unit 3b in the battery sensor 3 can be updated as appropriate based on the estimated open-circuit voltage OCVa.

  For this reason, when the characteristic change factor occurs in the battery 2, the map can be updated according to the changed characteristic. Therefore, the above-described map showing the relationship between the open-end voltage OCV and the charging rate SOC is used. The detection accuracy of the charging rate SOC can be improved.

  Further, in step S6 of FIG. 2, since the open end voltage OCVa at the time of full charge is estimated by linear correction after the start of charging of the battery 2, the battery does not have to wait for the elapsed time until the battery is actually fully charged. The map can be corrected promptly after the clear condition is satisfied.

  In the first correction shown in the first embodiment, the map characteristics are corrected to be offset in the Y-axis direction indicating OCV in FIG. 3 based on the open-circuit voltage OCVa at the time of full charge, but for more accurate map correction. The second correction based on the open end voltage OCV other than at the time of full charge as in Example 2 shown below can also be executed.

  As shown in FIG. 4, in the second embodiment, the ECU 4 is connected to the vehicle electrical device by CAN or LIN, and the control unit 4 b controls the discharge of the battery 2 by controlling the vehicle electrical device 9.

  That is, in the second embodiment, the control means 4b of the ECU 4 discharges the battery 2 by a predetermined amount at a low current and low voltage from when the charging rate SOC is fully charged, and is the open-circuit voltage OCV after discharging. The measuring means 3a measures the second open-ended voltage OCVb, and the correcting means 4c uses the second open-ended voltage OCVb to give a second correction command including a second correction for correcting the map stored in the storing means 3b. Output to the storage means 3b. When the storage means 3b receives the second correction command, the storage means 3b maps the first open end voltage OCVa to correspond to the charge rate SOC at the time of full charge and the second open end voltage OCVb to correspond to the charge rate SOC after discharging a predetermined amount. Correct.

  Hereinafter, the control content of the power supply control device 1 according to the second embodiment will be described with reference to the flowchart of FIG. In FIG. 5, the processing contents from step S1 to step S7 are the same as those shown in FIG. 2, and the differences will be mainly described.

  As shown in step S8 of FIG. 5, after the map update by the first correction in step S7, the control means 4b further charges the battery 2, and the positive condition of step S9 in which the battery 2 is actually fully charged. This charging is continued until is established. In step S9, the determination unit 4a determines whether or not the full charge is completed. If the determination is affirmative, the process proceeds to step S10. If the determination is negative, the process returns to step S8. If the measuring means 3a measures the first open-circuit voltage OCVa instead of estimation in step S6, the battery 2 is fully charged in the charging in step S5, and therefore the processing in steps S8 and S9 is omitted. Will be.

  In step S <b> 10, the control unit 4 b discharges the battery 2 by increasing the power consumption of the vehicle electrical device 9. This discharge is performed while the vehicle is not parked. In step S11, the determination unit 4a determines whether or not a predetermined amount of discharge has been completed. If the determination is affirmative, the process proceeds to step S12. If the determination is negative, the determination unit 4a returns to the position before step S10.

  In step S12, the measuring unit 3a estimates or measures the open-circuit voltage OCVb after discharge, and the correction unit 4c sets the open-circuit voltage OCVa at full charge and the open-circuit voltage OCVb after discharge as shown in FIG. A second correction command for correcting the map so as to match the characteristic curve is output to the storage unit 3b, and the storage unit 3b receives the second correction command and corrects the map again.

  According to the charging communication system S, the power supply control device 1 and the power supply model update method of the second embodiment described above, the following operational effects can be obtained. That is, the map stored in the storage unit 3b in the battery sensor 3 can be updated more accurately based on the estimated open-end voltage OCVa and open-circuit voltage OCVb.

  That is, when the characteristic change factor is generated in the battery 2, the map can be updated in accordance with the changed characteristic. Therefore, the above-described map showing the relationship between the open-end voltage OCV and the charging rate SOC is used. The detection accuracy of the charging rate SOC can be increased. In particular, as shown in FIG. 6, when the slope based on the difference between the open-circuit voltage OCVb after discharge and the open-circuit voltage OCVa at the time of full charge is below (different from) the characteristic curve before correction, the corrected characteristic is obtained. The slope of the curve is also changed, and a more accurate map can be performed to increase the detection accuracy of the charging rate SOC.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions are made to the above-described embodiments without departing from the scope of the present invention. be able to.

  For example, the charging device 5 is a combination of a plug-in charger and a DC / DC converter corresponding to a plug-in hybrid vehicle, instead of a DC / DC converter that converts the high-voltage battery power corresponding to the hybrid vehicle to a low voltage. If the vehicle has a solar power generation function, it can be replaced with a combination of a solar power generation device and a DC / DC converter. The charging start trigger in the case of replacement is that the plug-in hybrid vehicle has been plugged in, and that in the vehicle having the solar power generation function, the user has selected that function.

  Further, the method for determining whether or not the characteristic change factor of the battery 2 has occurred is not limited to the mode shown in the above-described embodiment, and the determination unit 4a can also be determined based on other parameters. .

  In addition, instead of the battery sensor 3 having the functions of the measurement unit 3a and the storage unit 3b, the ECU 4 may of course have the functions of the measurement unit and the storage unit. Further, when the battery sensor 3 or the battery 2 includes an ECU, the battery-side ECU may have all of the measurement unit, the storage unit, the determination unit, the control unit, and the correction unit as a functional burden.

  Further, the control power supply mode to the ECU 4 is not limited to the above-described embodiment as long as the battery 2 can be charged during parking. For example, the control power supply mode is not limited to the parking power source SW8. In addition, it may be connected to the control power source at a location other than the ground side of the traveling IGSW 6.

  Further, the in-vehicle LAN is not limited to the above-mentioned combination of CAN and lower-speed LIN, but may be CAN alone or LIN alone, multimedia communication protocol represented by MOST (Media Oriented Systems Transport), FlexRay, etc. Other suitable communication protocols may be used.

  The present invention relates to a power supply control device, a power supply model update method, a program, and a medium, and even if a characteristic change factor of a low-voltage battery occurs, a map showing a relationship between an open-ended voltage and a charging rate in accordance with the characteristic change Can be corrected and updated.

  For this reason, in the present invention, the charging rate can be obtained more accurately from the open-ended voltage using the updated map. Therefore, the present invention is useful when applied to various vehicles such as passenger cars, trucks, and buses having a low-voltage battery. Is. In particular, in a hybrid vehicle having a high voltage side battery and a step-down device, a plug-in hybrid vehicle or a vehicle having a solar charging function, the low voltage side battery can be more easily charged. The vehicle is more appropriate.

DESCRIPTION OF SYMBOLS 1 Power supply control apparatus 2 Battery 3 Battery sensor 3a Measuring means 3b Memory | storage means 4 ECU
4a determination means 4b control means 4c correction means 5 charging device 6 IGSW for traveling
7 Vehicle electrical equipment 8 Parking power supply SW
9 Power SW control ECU

Claims (5)

  Measuring means for measuring the open-ended voltage of the battery of the vehicle, storage means for storing a map indicating the relationship between the open-ended voltage and the charging rate, and determination for determining whether or not a characteristic change factor of the battery has occurred And a control means for controlling charging of the battery. When the determination means determines affirmative, the control means charges the battery when the vehicle is parked, and the measurement means Measuring or estimating a first open end voltage that is the open end voltage when the charging rate of the battery is fully charged, and including correction means for correcting the map using the first open end voltage. A power supply control device.   The control means discharges the battery by a predetermined amount from when the charging rate is fully charged, and the measurement means measures the second open end voltage that is the open end voltage after the discharge, and the second open end The power supply control apparatus according to claim 1, wherein the correction unit corrects the map using a voltage.   A measurement step for measuring the open-circuit voltage of the battery of the vehicle, a storage step for storing a map indicating a relationship between the open-circuit voltage and the charging rate, and a determination for determining whether or not a characteristic change factor of the battery has occurred And a control step for controlling the charging of the battery, and when the determination in the determination step is affirmative, the measurement step includes charging the battery when the vehicle is parked in the control step. Measuring or estimating a first open end voltage that is the open end voltage when the charge rate of the battery is fully charged, and correcting the map using the first open end voltage. Power supply model update method characterized by Program Ru to execute the power model update method according to the computer to claim 3. The computer-readable recording medium which recorded the program of Claim 4.

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