JP-2026075417-A - Vehicle control system

Abstract

[Problem] To provide a vehicle control device that can shut off the power supply from the auxiliary battery to the vehicle load without physically disconnecting the vehicle, such as when shutting off the power supply from the high-voltage battery to the vehicle load during vehicle inspection. [Solution] A vehicle control device mounted on a vehicle, comprising: an operating unit that receives an input requesting the cessation of power supply to an on-board load by human operation; a relay inserted between an auxiliary battery and an on-board load; and a control unit that, upon receiving an input from the operating unit, cuts off the power supply from the high-voltage battery to the on-board load, and then controls the relay to the off state to cut off the power supply from the auxiliary battery to the on-board load. [Selection Diagram] Figure 1

Inventors

• 高谷 航平

Assignees

• トヨタ自動車株式会社

Dates

Publication Date

20260508

Application Date

20241022

Claims (3)

1. A vehicle control device installed in a vehicle, An operating unit that receives input requesting the cessation of power supply to the vehicle load through human operation, A relay is inserted between the auxiliary battery and the vehicle load, A vehicle control device comprising: an operating unit that, upon receiving the input, shuts off the power supply from the high-voltage battery to the vehicle load, and then controls the relay to the off state to shut off the power supply from the auxiliary battery to the vehicle load.
2. The vehicle control device according to claim 1, wherein the operating unit is a momentary mechanical switch.
3. The vehicle control device according to claim 1 or 2, wherein the auxiliary battery is a lithium-ion battery.

Description

This disclosure relates to a vehicle control device installed in a vehicle. Patent Document 1 discloses a vehicle control device that can interrupt the power supply from the high-voltage battery to the low-voltage system at a timing desired by the user, such as when performing vehicle inspections or parts replacements. Japanese Patent Publication No. 2022-011974 Schematic diagram of a vehicle control device according to one embodiment of the present disclosure.A flowchart illustrating the processing procedure for power cut-off control performed by the vehicle control system.An example of information displayed on the meter during a power outage transition.A flowchart illustrating the processing procedure for power restoration control performed by the vehicle control system. The vehicle control device of this disclosure is equipped with a switch connected to an auxiliary lithium-ion battery, which cuts off the power supply from the auxiliary lithium-ion battery when the power supply from the high-voltage battery is stopped. This makes it possible to cut off the power supply from the auxiliary lithium-ion battery without disconnecting the connection. The embodiments of this disclosure will be described in detail below with reference to the drawings. <Implementation> [composition] Figure 1 is a schematic diagram illustrating a vehicle control device 100 according to one embodiment of the present disclosure. The vehicle control device 100 illustrated in Figure 1 includes a high-voltage battery 110, a DC-DC converter (DDC) 120, an auxiliary battery (auxiliary LiB) 130, an ECU 140, a mechanical switch (mechanical SW) 150, and a plurality of loads 160. In Figure 1, power lines through which power is exchanged are shown as solid lines, and signal lines through which requests and instructions are exchanged are shown as dashed lines. The vehicle control device 100 shown in Figure 1 is installed, for example, in electric vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs). The high-voltage battery 110 is a rechargeable secondary battery, such as a lithium-ion battery. The high-voltage battery 110 can supply the power it stores to multiple loads 160 connected to the ECU 140 via the DCDC converter 120. In electric vehicles, the drive battery corresponds to the high-voltage battery 110. The DC-DC converter 120 is installed between the high-voltage battery 110 and the ECU 140. It is a power converter that converts the voltage from the high-voltage battery 110 into the voltages required by the multiple loads 160 and outputs them to the ECU 140. For example, a step-up/step-down type DC-DC converter can be used for this DC-DC converter 120. The auxiliary battery 130 is a rechargeable secondary battery, such as a lithium-ion battery. The auxiliary battery (hereinafter referred to as "auxiliary LiB") 130 can supply its stored power to multiple loads 160 connected to the ECU 140 via the DCDC converter 120. Furthermore, the auxiliary LiB 130 can store power output from the high-voltage battery 110 via the DCDC converter 120 and the ECU 140. This auxiliary LiB 130 includes a battery 131, an auxiliary system main relay (SMR) 132, and an MCU 133. The battery 131 is configured, for example, as a battery pack with lithium-ion battery cells connected in series. The auxiliary system main relay (hereinafter referred to as "SMR") 132 is a switch that can switch the electrical connection state between the battery 131 and the ECU 140. A semiconductor relay or the like is used for this SMR 132. The MCU 133 is a control unit, for example, composed of a microcontroller, and can control the operation of the DC-DC converter 120 and the connection state of the SMR 132 according to the output of the mechanical switch (mechanical SW) 150. In controlling the operation of the DC-DC converter 120, the MCU 133 gives instructions to the ECU 140 via a network such as CAN. The ECU (Electronic Control Unit) 140 is an electronic control unit (such as a body ECU) for controlling the power supply to multiple loads 160 using the high-voltage battery 110 and auxiliary LiB 130 as power sources. This ECU 140 includes multiple switches (SW) 141 and MCU 142. The multiple switches (SW) 141 are switches for switching the load 160 to which power is supplied. Semiconductor relays or similar devices are used for these switches 141. The MCU 142 is a control unit, for example, a microcontroller, which appropriately controls the multiple switches 141 based on the vehicle's status. Furthermore, the MCU 142 can directly or indirectly control the operation of the DC-DC converter 120 via another ECU based on instructions provided by the MCU 133 of the auxiliary LiB 130. The mechanical switch (hereinafter referred to as "mech SW") 150 is an operating unit composed of a physical switch, such as a momentary switch. The mech SW 150 is mounted in the vehicle and is typically located in a place where it can