Search

JP-7856437-B2 - Power supply control device and power supply control method

JP7856437B2JP 7856437 B2JP7856437 B2JP 7856437B2JP-7856437-B2

Inventors

  • 菊本 伊久男
  • 小山 輝芳

Assignees

  • 株式会社デンソーテン

Dates

Publication Date
20260511
Application Date
20220119

Claims (9)

  1. A power control device for controlling the power supply of a vehicle, comprising a control unit, The control unit, Based on the detection result of the vehicle's ignition switch, when controlling the backup power supply while the vehicle's ignition is off, it is determined whether there is a connection abnormality in the backup power supply, and if it is determined that there is no connection abnormality in the backup power supply, the boost circuit that increases the voltage of the backup power supply is turned on . Power supply control device.
  2. A power control device for controlling the power supply of a vehicle, Control unit and It has a temperature measuring circuit that acquires a first temperature, which is the temperature of the backup power supply, and a second temperature, which is the temperature of the circuit board of the circuit section related to the control of the backup power supply. The control unit, In controlling the backup power supply while the vehicle's ignition is off, the system determines whether there is a connection abnormality in the backup power supply based on the first temperature or the second temperature , and if it determines that there is no connection abnormality in the backup power supply, it turns on a boost circuit that increases the voltage of the backup power supply . Power supply control device.
  3. The control unit, At least determine whether the backup power supply is reverse-connected or disconnected, The power control device according to claim 2 .
  4. The system further includes a backup power supply voltage acquisition unit that acquires the voltage of the aforementioned backup power supply, The control unit, If the voltage of the backup power supply is below a threshold and the first temperature is within a predetermined low-temperature range, it is determined that the backup power supply is in the reverse-connected or unconnected state. The power control device according to claim 3 .
  5. The control unit, If the voltage of the backup power supply is below a threshold and the first temperature is not within the low temperature range, it is determined that the backup power supply is in an over-discharge state. The power control device according to claim 4 .
  6. A power control device for controlling the power supply of a vehicle, comprising a control unit, The control unit, In controlling the backup power supply while the vehicle's ignition is off, it is determined whether there is a connection abnormality in the backup power supply, and if it is determined that there is no connection abnormality in the backup power supply, the boost circuit that increases the voltage of the backup power supply is turned on, After turning on the boost circuit, it is further determined whether there is a connection abnormality in the backup power supply. Power supply control device.
  7. The system further includes a voltage acquisition unit that acquires the voltage of the vehicle's constant power supply, the boosted voltage of the backup power supply by the boost circuit, and the voltage of the backup power supply. The control unit, If the voltage of the constant power supply is below a threshold, and the difference between the boosted voltage of the backup power supply by the boost circuit and the voltage of the backup power supply is smaller than a predetermined value, it is determined that a connection abnormality has occurred in the backup power supply. The power control device according to claim 6 .
  8. It has an automatic notification function that, if the power supply from the constant power source is interrupted, receives power from the backup power source and automatically notifies an external information system. The power control device according to claim 7 .
  9. A power control method performed by a power control device that controls the power supply of a vehicle, Based on the detection result of the vehicle's ignition switch, when controlling the backup power supply while the vehicle's ignition is off, it is determined whether there is a connection abnormality in the backup power supply, and if it is determined that there is no connection abnormality in the backup power supply, the boost circuit that increases the voltage of the backup power supply is turned on . A power control method including

Description

The embodiments of the disclosure relate to a power supply control device and a power supply control method. Conventionally, Telematics Control Units (TCUs), which are mounted in vehicles and capable of wireless communication with external information systems, are known. Some TCUs have functions such as vehicle theft tracking and towing notification, as well as an automatic notification function called eCall, which automatically reports the vehicle's location information to a central control center in the event of a collision. Furthermore, the TCU (Traction Control Unit) is equipped with a backup battery, such as a lithium-ion secondary battery, to ensure operation even if the power supply from the vehicle battery is interrupted due to impact during an accident. The backup battery will be replaced when it becomes unusable due to deterioration over time, etc., but such replacement is expected to be performed while the vehicle's ignition (IG) is off. Therefore, the backup battery's control is based on the assumption that the vehicle's ignition is on, and there is a restriction that the backup battery cannot be used when the ignition is off. Therefore, even if there is a connection error in the backup battery, such as the backup battery being accidentally connected in reverse during replacement, the error cannot be detected until the ignition is turned on. Note that Patent Document 1 discloses a technology that cuts off power to the boost circuit when an error such as reverse battery connection occurs after the ignition is turned on (see, for example, Patent Document 1). Japanese Patent Publication No. 2020-137235 Figure 1 is a block diagram showing an example configuration of a TCU according to an embodiment.Figure 2 shows an example of the configuration of the BUB and circuit section according to the embodiment.Figure 3 is a flowchart showing the processing procedure executed by the TCU according to the embodiment.Figure 4 is a flowchart showing the processing procedure for the battery connection status check process shown in Figure 3.Figure 5 is a flowchart showing the processing procedure for the BATT voltage check process shown in Figure 3. The embodiments of the power control device and power control method disclosed herein will be described in detail below with reference to the attached drawings. However, this invention is not limited to the embodiments described below. Furthermore, the following explanation will use the case where the power control device according to the embodiment is a TCU 10 as an example. Also, in the following, the backup battery provided by the TCU 10 will be referred to as "BUB" (Back Up Battery) as appropriate. Also, in the following, the vehicle battery provided by the vehicle will be referred to as "BATT" as appropriate. Figure 1 is a block diagram showing an example configuration of the TCU 10 according to this embodiment. Note that Figure 1 only shows the components necessary to explain the features of this embodiment, and descriptions of general components are omitted. In other words, each component shown in Figure 1 is a functional concept and does not necessarily need to be physically configured as illustrated. For example, the specific forms of distribution and integration of each block are not limited to those shown; all or part of them can be functionally or physically distributed and integrated in any unit according to various loads and usage conditions. As shown in Figure 1, the TCU 10 is connected to the BATT 3, the IG sensor 5, the ECU (Electronic Control Unit) 7, the emergency call button 8, and the microphone speaker unit 9. BATT3 is the vehicle battery installed in the vehicle. IG sensor 5 is a sensor that detects the state of the IG switch. ECU 7 is a variety of ECUs installed in the vehicle. ECU 7 includes the airbag ECU. TCU 10 activates the eCall function when it is notified by the airbag ECU that the airbag has deployed. TCU 10 can also activate the eCall function based on user input. For example, TCU 10 activates the eCall function when the user presses the emergency call button 8. The microphone-speaker unit 9 is an input/output device for audio information, such as a microphone and speaker, mounted on the vehicle. The microphone-speaker unit 9 inputs or outputs audio information during the operation of the eCall function. Note that the microphone-speaker unit 9 is not limited to a single integrated unit; the microphone and speaker may be separate components. The TCU 10 comprises a BUB 11, a circuit unit 12, a communication unit 13, a storage unit 14, and a control unit 15. The BUB 11 is a battery pack containing one or more secondary batteries 11a (see Figure 2), which will be described later. The circuit unit 12 is a peripheral circuit of the BUB 11 related to its control. The communication unit 13 is a communication module that enables wireless communication with external information systems via a C-V2X (Cellular Vehicle to Everything) communication n