US 12,330,514 B2
In-vehicle system and vehicle brake diagnostic device with a single relay connection
Kenichi Iwata, Osaka (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Jan. 12, 2023, as Appl. No. 18/153,558.
Claims priority of application No. 2022-027769 (JP), filed on Feb. 25, 2022.
Prior Publication US 2023/0271505 A1, Aug. 31, 2023
Int. Cl. B60L 3/00 (2019.01)
CPC B60L 3/0076 (2013.01) [B60L 3/0046 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An in-vehicle system installed in a vehicle, the in-vehicle system comprising:
a main battery;
a sub-battery;
a brake system that is connected to the main battery and is connected to the sub-battery through one semiconductor relay, the main battery being configured to supply electric power to the brake system, and the sub-battery being configured to supply electric power to the brake system;
a diagnostic unit that is configured to diagnose a presence or absence of an abnormality in the brake system; and
a control unit configured to control charging and discharging of the sub-battery,
wherein:
the diagnostic unit is configured to perform notification regarding a diagnosis start to the control unit when the diagnostic unit starts diagnosis of the brake system,
the control unit is configured to perform discharge control of the sub-battery, based on the diagnosis start notification from the diagnostic unit, and
the control unit is configured to set a voltage of a first terminal of the semiconductor relay to which the sub-battery is connected, such that the voltage of the first terminal is higher than a voltage of a second terminal of the semiconductor relay to which the brake system is connected, based on the diagnosis start notification from the diagnostic unit.