Power supply control system

Abstract

To provide a power supply control system for inhibiting a final deterioration state of an on-vehicle power supply unit from being active material softening or sulfation.SOLUTION: A power supply control system 1 comprises: an acquisition unit 20 for acquiring use state information on an on-vehicle power supply unit 14; a deterioration determination unit 24 that on the basis of a result acquired by the acquisition unit 20, calculates states of lattice corrosion, active material softening, and sulfation of the on-vehicle power supply unit 14 and, on the basis of a result of the calculation, determines if a deterioration mode of the on-vehicle power supply unit 14 is any of the lattice corrosion, the active material softening, and the sulfation; and a controlling unit 26 that when it is determined that the deterioration mode of the on-vehicle power supply unit 14 is the active material softening or the sulfation, restricts discharging at the on-vehicle power supply unit 14.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an in-vehicle power supply control system. [Background technology]

[0002] Patent Document 1 discloses a power supply system including a lead battery that supplies power to an electrical load of a vehicle, a battery sensor unit that acquires values related to the state of the lead battery, and a battery degradation determination device that determines degradation of the lead battery based on the values acquired by the battery sensor unit. This power supply system calculates the value of the effective charge / discharge amount of the lead battery based on the charge amount, discharge amount, and depth of discharge acquired by the battery sensor unit, and determines degradation due to positive electrode lattice softening based on this value of the effective charge / discharge amount. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-78572 Summary of the Invention [Problem to be solved by the invention]

[0004] Calculating the state of battery degradation due to positive grid softening is more difficult than calculating the state of degradation due to grid corrosion.

[0005] An object of the present invention is to provide a power supply control system that prevents the final degradation state of an on-board power supply unit from becoming softening or sulfation of the active material. [Means for solving the problem]

[0006] In order to solve the above problems, a power supply control system according to one embodiment of the present invention includes an acquisition unit that acquires usage status information of an on-board power supply unit, a degradation determination unit that calculates the state of grating corrosion, active material softening, and sulfation of the on-board power supply unit based on the acquired usage status information and determines whether the degradation mode of the on-board power supply unit is grating corrosion, active material softening, or sulfation based on the calculation results, and a control unit that limits discharge in the on-board power supply unit when the degradation mode of the on-board power supply unit is determined to be active material softening or sulfation. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a power supply control system that prevents the final degradation state of an on-board power supply unit from becoming softened or sulfation of the active material. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating a functional configuration of a power supply control system according to an embodiment. [Figure 2] 1 is a flowchart of a power supply control method according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] 1 is a diagram showing the functional configuration of a power supply control system 1 according to an embodiment. The power supply control system 1 is mounted on a vehicle. The vehicle on which the power supply control system 1 is mounted may be a PHEV (Plug-in Hybrid Electric Vehicle), a BEV (Battery Electric Vehicle), an HEV (Hybrid Electric Vehicle), or an FCEV (Fuel Cell Electric Vehicle), and may have an automatic driving control function that enables the vehicle to travel autonomously.

[0010] The power supply control system 1 includes a power supply control device 10, an on-vehicle sensor 12, and an on-vehicle power supply unit 14. The on-vehicle power supply unit 14 is a main power supply unit and / or an auxiliary power supply unit mounted on a vehicle. The on-vehicle power supply unit 14 is rechargeable.

[0011] The on-board sensor 12 detects usage status information of the on-board power supply unit 14. The on-board sensor 12 is composed of multiple sensors. The usage status information of the on-board power supply unit 14 includes information indicating the discharge amount, number of discharges, charge amount, voltage and liquid temperature during use of the on-board power supply unit 14, and information indicating whether the on-board power supply unit 14 is on or off. The information indicating whether the on-board power supply unit 14 is on or off may be information indicating whether the ignition switch is on or off, and is the start and end times of use of the on-board power supply unit 14, indicating the usage time of the on-board power supply unit 14.

[0012] The power supply control device 10 includes an acquisition unit 20, a storage unit 22, a deterioration determination unit 24, and a control unit 26. The acquisition unit 20 acquires usage status information of the on-board power supply unit 14 from the on-board sensor 12. The storage unit 22 accumulates the usage status information of the on-board power supply unit 14.

[0013] The deterioration determination unit 24 calculates the deterioration state of the on-board power supply unit 14 for each type of deterioration based on the accumulated usage state information of the on-board power supply unit 14. Types of deterioration states of the on-board power supply unit 14 include grid corrosion, active material softening, and sulfation. Active material softening may be softening or falling off of the positive electrode active material. Sulfation may be sulfation of the negative electrode. The deterioration state of grid corrosion can be determined in proportion to the liquid temperature of the on-board power supply unit 14. Active material softening is caused by repeated discharges, and sulfation progresses as the on-board power supply unit 14 is maintained in a discharged state.

[0014] The deterioration determination unit 24 calculates the cumulative deterioration rate, the deterioration rate between the previous trips, and the predicted life for each deterioration state for lattice corrosion, active material softening, and sulfation.

[0015] The deterioration determination unit 24 determines which of the deterioration modes of the on-board power supply unit 14 will ultimately cause the on-board power supply unit 14 to reach the end of its life, based on the deterioration states of lattice corrosion, active material softening, and sulfation. For example, the deterioration determination unit 24 determines in which deterioration state the on-board power supply unit 14 is most likely to reach the end of its life, based on the amount of change in the deterioration rate relative to the most recent usage time, the predicted life, etc., and determines that the most likely deterioration state is the current deterioration mode.

[0016] When the deterioration determination unit 24 determines that the deterioration mode of the on-board power supply unit 14 is due to softening of the active material or sulfation, the deterioration determination unit 24 sends a restriction request to restrict discharge in the on-board power supply unit 14. The timing at which the deterioration determination unit 24 determines the deterioration mode of the on-board power supply unit 14 may be set in advance, and may be, for example, the timing at which the ignition switch is turned on, or may be executed when a time condition, such as the passage of one day, is satisfied.

[0017] When the deterioration determination unit 24 determines that the deterioration mode of the on-board power supply unit 14 is due to active material softening or sulfation, the control unit 26 limits the discharge of the on-board power supply unit 14. For example, the control unit 26 transitions from an unrestricted normal mode to a discharge limit mode that limits the discharge of the on-board power supply unit 14. In the discharge limit mode, a limit is set on the depth of discharge of the on-board power supply unit 14, and when the depth of discharge limit is exceeded, some on-board functions may be turned off to reduce the amount of discharge from the on-board power supply unit 14.

[0018] The softening of the active material and sulfation of the on-board power supply unit 14 do not affect the voltage of the on-board power supply unit 14 until the end of its life, and the user may become aware of the end of its life when the battery runs out. On the other hand, grate corrosion can be detected by monitoring the liquid temperature and voltage of the on-board power supply unit 14. Therefore, if the final degradation mode is grate corrosion, it is easy to determine the end of the life of the on-board power supply unit 14.

[0019] Therefore, the deterioration determination unit 24 monitors the deterioration state of the on-board power supply unit 14 and requests restrictions to suppress deterioration due to active material softening and sulfation, so that the on-board power supply unit 14 will eventually experience grid corrosion. This makes it possible to prevent the on-board power supply unit 14 from eventually reaching the end of its life due to active material softening or sulfation, resulting in a dead battery.

[0020] 2 is a flowchart of a power supply control method according to an embodiment. The acquisition unit 20 acquires on / off information of an ignition switch (S10). The on / off information of the ignition switch indicates the usage time of the in-vehicle power supply unit 14 and the start and end of discharge.

[0021] The acquisition unit 20 acquires usage status information of the on-board power supply unit 14, such as information indicating the discharge amount, the number of discharges, the charge amount, the voltage during use, and the liquid temperature, from the on-board sensor 12 (S12). This usage status information of the on-board power supply unit 14 is stored in the storage unit 22.

[0022] The deterioration determination unit 24 calculates the state of lattice corrosion, active material softening, and sulfation of the on-board power supply unit 14 based on the accumulated usage state information of the on-board power supply unit 14 (S14).The deterioration determination unit 24 determines the deterioration mode of the on-board power supply unit 14, which is the deterioration state that will ultimately lead to the end of its life, based on the deterioration states of the lattice corrosion, active material softening, and sulfation (S16).

[0023] The deterioration determination unit 24 determines whether the deterioration mode of the on-board power supply unit 14 is active material softening or sulfation (S18). If the deterioration mode of the on-board power supply unit 14 is active material softening or sulfation (Y in S18), the deterioration determination unit 24 requests the control unit 26 to limit discharge in the on-board power supply unit 14, and the control unit 26 receives the request and limits discharge in the on-board power supply unit 14 (S20).

[0024] If the degradation mode of the vehicle-mounted power supply unit 14 is not active material softening or sulfation but grid corrosion (N in S18), the process ends without taking any action on the vehicle-mounted power supply unit 14.

[0025] The present disclosure has been described above based on examples. The present disclosure is not limited to the above examples, and various modifications such as design changes may be made based on the knowledge of those skilled in the art. [Explanation of symbols]

[0026] 1 power supply control system, 10 power supply control device, 12 on-board sensor, 14 on-board power supply unit, 20 acquisition unit, 22 retention unit, 24 deterioration determination unit, 26 control unit.

Claims

[Claim 1] an acquisition unit that acquires usage status information of an in-vehicle power supply unit; a deterioration determination unit that calculates the state of grid corrosion, active material softening, and sulfation of the on-board power supply unit based on the acquired usage state information, and determines whether the deterioration mode of the on-board power supply unit is grid corrosion, active material softening, or sulfation based on the calculation result; a control unit that limits discharge in the on-board power supply unit when it is determined that the deterioration mode of the on-board power supply unit is active material softening or sulfation.

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