JP-7855999-B2 - In-vehicle device, control method, and program

JP7855999B2JP 7855999 B2JP7855999 B2JP 7855999B2JP-7855999-B2

Inventors

内野剛雄
小田康太
谷中裕太

Assignees

株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社

Dates

Publication Date: 20260511
Application Date: 20221226

Claims (20)

An on-board device mounted in a vehicle that controls the supply of power to one or more loads, The condition of the aforementioned vehicle is, The vehicle is started, the power switch or ignition switch is on, or there are occupants inside the vehicle, and the load's current consumption is normal current, and This includes a state in which the vehicle is stopped, the power switch or ignition switch is off, or there are no occupants in the vehicle, and the load's current consumption is lower than the normal current. A mechanical relay connected between the vehicle's battery power supply and the load, A first semiconductor relay connected in parallel with the aforementioned mechanical relay, A first control circuit that turns on the mechanical relay when the vehicle is in a normal current state, and turns off the mechanical relay when the vehicle is in a low current state, An in-vehicle device comprising: a second control circuit that turns off the first semiconductor relay when the vehicle is in a normal current state, and turns on the first semiconductor relay when the vehicle is in a low current state.
An on-board device mounted in a vehicle that controls the supply of power to one or more loads, The state of the vehicle includes a normal current state in which the load's current consumption is normal current, and a low current state in which the load's current consumption is less than normal current. A mechanical relay connected between the vehicle's battery power supply and the load, A first semiconductor relay connected in parallel with the aforementioned mechanical relay, A first control circuit that turns on the mechanical relay when the vehicle is in a normal current state, and turns off the mechanical relay when the vehicle is in a low current state, A second control circuit that turns off the first semiconductor relay when the vehicle is in a normal current state, and turns on the first semiconductor relay when the vehicle is in a low current state, A processing unit capable of determining the state of the vehicle and Equipped with, The aforementioned processing unit, Determine the state of the vehicle, A first voltage value is obtained at a point in the current path that is downstream of the mechanical relay and the first semiconductor relay and upstream of the load. Based on the determination result of the vehicle's condition and the first voltage value, it is determined whether the mechanical relay or the first semiconductor relay has failed. If it is determined that the mechanical relay or the first semiconductor relay has failed, the determination result is output. If the vehicle is in a low-current state and it is determined that the first semiconductor relay has failed, the first control circuit will turn on the mechanical relay. In-vehicle device.
The system includes a processing unit capable of determining the state of the vehicle, The aforementioned processing unit, Determine the state of the vehicle, A first voltage value is obtained at a point in the current path that is downstream of the mechanical relay and the first semiconductor relay and upstream of the load. Based on the determination result of the vehicle's condition and the first voltage value, it is determined whether the mechanical relay or the first semiconductor relay has failed. The in-vehicle device according to claim 1, which outputs a determination result when it is determined that the mechanical relay or the first semiconductor relay has failed.
The aforementioned processing unit, The in-vehicle device according to claim 3 , wherein if it is determined that the first semiconductor relay has failed, the first control circuit is instructed to turn on the mechanical relay.
The first semiconductor relay is an N-channel FET in which the drain is located upstream of the source in the current path. The system includes a second semiconductor relay, which is an N-channel type FET connected in series with the first semiconductor relay, and whose source is located upstream of the drain in the current path. The in-vehicle device according to claim 1, wherein the second control circuit turns off the second semiconductor relay when the vehicle is in a normal current state, and turns on the second semiconductor relay when the vehicle is in a low current state.
The system includes a processing unit capable of determining the state of the vehicle, The aforementioned processing unit, Determine the state of the vehicle, A first voltage value is obtained at a point in the current path that is downstream of the mechanical relay, the first semiconductor relay, and the second semiconductor relay, and upstream of the load. The second voltage value is obtained at the point between the first semiconductor relay and the second semiconductor relay in the current path. Based on the determination result of the vehicle's condition, the first voltage value, and the second voltage value, it is determined whether the mechanical relay, the first semiconductor relay, or the second semiconductor relay has failed. The in-vehicle device according to claim 5 , which outputs a determination result when it is determined that the mechanical relay, the first semiconductor relay, or the second semiconductor relay has failed.
The aforementioned processing unit, The in-vehicle device according to claim 6 , wherein if it is determined that the first semiconductor relay or the second semiconductor relay has failed, the first control circuit is instructed to turn on the mechanical relay.
The first semiconductor relay is connected in parallel with a second semiconductor relay, The in-vehicle device according to claim 1, wherein the second control circuit turns off the second semiconductor relay when the vehicle is in a normal current state, and turns on the second semiconductor relay when the vehicle is in a low current state.
A resistor located downstream of the first semiconductor relay in the current path, A fault detection circuit that outputs a resistance voltage value that rises when the voltage value across the resistor increases, The system includes a processing unit capable of determining the state of the vehicle, The aforementioned processing unit, Determine the state of the vehicle, The first voltage value at a point in the current path that is downstream of the mechanical relay, the first semiconductor relay, and the second semiconductor relay and upstream of the load, and the resistance voltage value output by the fault detection circuit are obtained. Based on the determination result of the vehicle's condition, the first voltage value, and the resistance voltage value, it is determined whether the mechanical relay, the first semiconductor relay, or the second semiconductor relay has failed. The in-vehicle device according to claim 8 , which outputs a determination result when it is determined that the mechanical relay, the first semiconductor relay, or the second semiconductor relay has failed.
The aforementioned processing unit, The in-vehicle device according to claim 9 , wherein if it is determined that the first semiconductor relay and the second semiconductor relay have failed, the first control circuit is instructed to turn on the mechanical relay.
The first semiconductor relay is an N-channel FET in which the drain is located upstream of the source in the current path. The system includes a second semiconductor relay, which is an N-channel type FET connected in series with the first semiconductor relay, and in the current path, the drain is located upstream of the source. The in-vehicle device according to claim 1, wherein the second control circuit turns off the second semiconductor relay when the vehicle is in a normal current state, and turns on the second semiconductor relay when the vehicle is in a low current state.
The system includes a processing unit capable of determining the state of the vehicle, The aforementioned processing unit, Determine the state of the vehicle, A first voltage value is obtained at a point in the current path that is downstream of the mechanical relay, the first semiconductor relay, and the second semiconductor relay, and upstream of the load. The second voltage value is obtained at the point between the first semiconductor relay and the second semiconductor relay in the current path. Based on the determination result of the vehicle's condition, the first voltage value, and the second voltage value, it is determined whether the mechanical relay, the first semiconductor relay, or the second semiconductor relay has failed. The in-vehicle device according to claim 11 , which outputs a determination result when it is determined that the mechanical relay, the first semiconductor relay, or the second semiconductor relay has failed.
The aforementioned processing unit, The in-vehicle device according to claim 12 , wherein if it is determined that the first semiconductor relay or the second semiconductor relay has failed, the first control circuit is instructed to turn on the mechanical relay.
The first semiconductor relay is a P-channel type FET in which the source is located upstream of the drain in the current path. The in-vehicle device according to claim 1, wherein the second control circuit turns off the first semiconductor relay by increasing the voltage applied to the gate of the first semiconductor relay when the vehicle is in a normal current state, and turns on the first semiconductor relay by decreasing the voltage applied to the gate of the first semiconductor relay when the vehicle is in a low current state.
The system includes a processing unit capable of determining the state of the vehicle, The aforementioned processing unit, Determine the state of the vehicle, A first voltage value is obtained at a point in the current path that is downstream of the mechanical relay and the first semiconductor relay and upstream of the load. Based on the determination result of the vehicle's condition and the first voltage value, it is determined whether the mechanical relay or the first semiconductor relay has failed. The in-vehicle device according to claim 14 , which outputs a determination result when it is determined that the mechanical relay or the first semiconductor relay has failed.
The aforementioned processing unit, The in-vehicle device according to claim 15 , wherein if it is determined that the first semiconductor relay has failed, the first control circuit is instructed to turn on the mechanical relay.
A control method for an on-board device mounted on a vehicle that controls the supply of power to a load, The in-vehicle device is A mechanical relay connected between the battery power supply and the load, The system comprises a first semiconductor relay connected in parallel with the aforementioned mechanical relay, The condition of the aforementioned vehicle is, The vehicle is started, the power switch or ignition switch is on, or there are occupants inside the vehicle, and the load's current consumption is normal current, and When the vehicle is stopped, the power switch or ignition switch is off, or there are no occupants in the vehicle, and the load's current consumption is low, which is less than the normal current, Includes, When the vehicle is in a normal current state, the mechanical relay is turned on. If the vehicle is in a low current state, the mechanical relay is turned off. When the vehicle is in a normal current state, the first semiconductor relay is turned off. A control method for turning on the first semiconductor relay when the vehicle is in a low current state.
A control method for an on-board device mounted on a vehicle that controls the supply of power to a load, The aforementioned in-vehicle device is A mechanical relay connected between the battery power supply and the load, A first semiconductor relay connected in parallel with the aforementioned mechanical relay and Equipped with, When the vehicle is in a normal current state, the mechanical relay is turned on. If the vehicle is in a low current state, the mechanical relay is turned off. When the vehicle is in a normal current state, the first semiconductor relay is turned off. When the vehicle is in a low current state, the first semiconductor relay is turned on. Determine the state of the vehicle, A first voltage value is obtained at a point in the current path that is downstream of the mechanical relay and the first semiconductor relay and upstream of the load. Based on the determination result of the vehicle's condition and the first voltage value, it is determined whether the mechanical relay or the first semiconductor relay has failed. If it is determined that the mechanical relay or the first semiconductor relay has failed, the determination result is output. If it is determined that the first semiconductor relay has failed while the vehicle is in a low-current state, the mechanical relay is turned on. Control method.
A program that causes a computer to execute a process to control an on-board device installed in a vehicle that controls the supply of power to the load, The in-vehicle device is A mechanical relay connected between the battery power supply and the load, The system comprises a first semiconductor relay connected in parallel with the aforementioned mechanical relay, The condition of the aforementioned vehicle is, The vehicle is started, the power switch or ignition switch is on, or there are occupants inside the vehicle, and the load's current consumption is normal current, and When the vehicle is stopped, the power switch or ignition switch is off, or there are no occupants in the vehicle, and the load's current consumption is low, which is less than the normal current, Includes, When the vehicle is in a normal current state, the mechanical relay is turned on. If the vehicle is in a low current state, the mechanical relay is turned off. When the vehicle is in a normal current state, the first semiconductor relay is turned off. A program that causes a computer to perform a process to turn on the first semiconductor relay when the vehicle is in a low current state.
The computer executes a process to control the onboard device installed in the vehicle that controls the power supply to the load. It is a program that makes it happen. The aforementioned in-vehicle device is A mechanical relay connected between the battery power supply and the load, A first semiconductor relay connected in parallel with the aforementioned mechanical relay and Equipped with, When the vehicle is in a normal current state, the mechanical relay is turned on. If the vehicle is in a low current state, the mechanical relay is turned off. When the vehicle is in a normal current state, the first semiconductor relay is turned off. When the vehicle is in a low current state, the first semiconductor relay is turned on. Determine the state of the vehicle, A first voltage value is obtained at a point in the current path that is downstream of the mechanical relay and the first semiconductor relay and upstream of the load. Based on the determination result of the vehicle's condition and the first voltage value, it is determined whether the mechanical relay or the first semiconductor relay has failed. If it is determined that the mechanical relay or the first semiconductor relay has failed, the determination result is output. If it is determined that the first semiconductor relay has failed while the vehicle is in a low-current state, the mechanical relay is turned on. A program that instructs a computer to perform a process.

Description

This invention relates to an in-vehicle device, a control method, and a program. The vehicle is equipped with a power supply control device (see, for example, Patent Document 1) that controls the supply of power from the battery to the load. In the power supply control device described in Patent Document 1, a semiconductor switch is provided in the current path of the current flowing from the battery to the load, and the power supply from the battery to the load is controlled by switching the semiconductor switch on or off. A semiconductor switch has a control terminal. For example, if the semiconductor switch is an FET (Field Effect Transistor), the control terminal is the gate. The resistance between the ends of the semiconductor switch changes according to the voltage at the control terminal. By adjusting the voltage at the control terminal, the resistance between the ends of the semiconductor switch can be adjusted to a sufficiently small value, switching the semiconductor switch ON. By adjusting the voltage at the control terminal, the resistance between the ends of the semiconductor switch can be adjusted to a sufficiently large value, switching the semiconductor switch OFF. Japanese Patent Publication No. 2013-143905 This is a block diagram showing the main components of the power supply system in Embodiment 1.This is a block diagram showing the main components of the microcontroller in Embodiment 1.This flowchart shows the control processing procedure by the second control circuit in Embodiment 1.This is a flowchart showing the control processing procedure by the microcontroller in Embodiment 1.This is a block diagram showing the main components of the power supply system in Embodiment 2.This is a block diagram showing the main components of the microcontroller in Embodiment 2.This is a flowchart showing the control processing procedure by the second control circuit in Embodiment 2.This is a flowchart showing the control processing procedure by the microcontroller in Embodiment 2.This is a block diagram showing the main components of the power supply system in Embodiment 3.This is a block diagram showing the main components of the microcontroller in Embodiment 3.This is a flowchart showing the control processing procedure by the microcontroller in Embodiment 3.This is a block diagram showing the main components of the power supply system in Embodiment 4.This is a block diagram showing the main components of the power supply system in Embodiment 5. [Description of Embodiments of the Invention] First, embodiments of the present invention will be listed and described. At least some of the embodiments described below may be combined in any way. (1) An in-vehicle device according to one aspect of the present disclosure is an in-vehicle device mounted on a vehicle and controlling the supply of power to one or more loads, wherein the state of the vehicle includes a normal current state in which the current consumption of the load is normal current and a low current state in which the current consumption of the load is less than normal current, and comprises a mechanical relay connected between the vehicle's battery power supply and the load, a first semiconductor relay connected in parallel with the mechanical relay, a first control circuit that turns on the mechanical relay when the vehicle is in the normal current state and turns off the mechanical relay when the vehicle is in the low current state, and a second control circuit that turns off the first semiconductor relay when the vehicle is in the normal current state and turns on the first semiconductor relay when the vehicle is in the low current state. In this embodiment, power supplied from the battery power source is supplied to the load via an on-board device. That is, the on-board device operates as a power supply control device. When the vehicle is running, normal current flows from the battery power source to the load, and when the vehicle is stopped, a low current (dark current) flows from the battery power source to the load. The value of the low current is lower than the value of the normal current, for example, 10mA to 100mA. The value of the low current is a low value, for example, about one-hundredth or one-thousandth of the value of the normal current. When the vehicle is stopped, the current supplied to the vehicle's load is reduced to a low current, thereby reducing the consumption of the battery power source. The vehicle starts, for example, when the power switch or ignition switch is on, and stops when it is off. Normal current flows from the battery power source to the load via a mechanical relay provided in the on-board device. Alternatively, the vehicle may be configured such that normal current flows to the load when there are occupants inside the vehicle, and low current flows to the load when there are no occupants inside the vehicle. As the number of times a mechanical relay is switched on or off (contact count) increases, the