Vehicle power supply system

Abstract

To provide a vehicle power supply system that is able to specify a place where an anomaly occurs when the anomaly occurs in supply of electrical power.SOLUTION: A vehicle power supply system mounted on a vehicle, comprises: a first power supply connected to a load group of a first system so as to be capable of supplying electric power; a second power supply connected to a load group of a second system so as to be capable of supplying electric power; a first switch inserted between the first power supply and a first load belonging to the load group of the first system; a second switch inserted between the second power supply and a second load belonging to the load group of the second system; a third switch inserted between the first power supply and the second power supply; and a control unit configured to control conduction / cutoff states of the first switch, the second switch, and the third switch. When an anomaly occurs in supply of electric power, the control unit controls the first switch, the second switch, and the third switch and specifies a place where the anomaly occurs based on a current flowing through the first switch and a current flowing through the second switch.SELECTED DRAWING: Figure 1

Claims

1. A vehicle power supply system installed in a vehicle, A first power supply connected to a first load group capable of supplying power, A second power supply connected to a second load group capable of supplying power, A first switch is inserted between the first power supply and a first load belonging to the first load group that does not require a redundant power supply configuration, A fourth switch is inserted between the first power supply and a redundant load belonging to the first load group that requires a redundant power supply configuration, A second switch is inserted between the second power supply and a second load belonging to the second load group that does not require a redundant power supply configuration, A fifth switch is inserted between the second power supply and a redundant load belonging to the second load group that requires a redundant power supply configuration, A third switch is inserted between the first power supply and the second power supply, The system comprises a control unit that controls the conduction / disconnection state of the first switch, the second switch, the third switch, the fourth switch, and the fifth switch, When an abnormality occurs in the power supply, the control unit controls the conduction / disconnection state of the first switch, the second switch, and the third switch while keeping the fourth switch and the fifth switch in a conductive state, and identifies the location where the abnormality occurred based on the current flowing through the first switch and the current flowing through the second switch. Vehicle power system.

2. If an abnormality occurs in the power supply, the control unit will shut off the third switch, The current flowing through the first switch is obtained when the first switch is conducting and when it is disconnected, and if the change in the current flowing through the first switch is greater than or equal to a first threshold, the area below the first switch is identified as the location where the abnormality occurred. The current flowing through the second switch is obtained when it is conducting and when it is disconnected, and if the change in the current flowing through the second switch is greater than or equal to a second threshold, the area below the second switch is identified as the location where the abnormality occurred. The vehicle power supply system according to claim 1.

3. If the control unit identifies the area under the first switch as the location where the abnormality occurred, it controls the first switch to an off state; if it identifies the area under the second switch as the location where the abnormality occurred, it controls the second switch to an off state. The vehicle power supply system according to claim 2.

4. The first and second loads are loads that, even if the power supply is interrupted during the period in which the control unit performs abnormality detection processing, will not affect the safety of vehicle operation. A vehicle power supply system according to any one of claims 1 to 3.

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