Patent ID: 9599971
Date: 2017-03-21
CPC Classifications: G05B,H04L,Y02D

Claim:
1. A method for operating an onboard power supply system in a motor vehicle, the onboard power supply system having a master controller, a slave controller, in which the master controller communicates with the slave controller via a subsidiary bus system and an onboard power supply system component via a main bus system, which comprises the steps of: putting the slave controller into an operating mode and switching the master controller to a transmission mode, in which the master controller coordinates communication between the slave controller and the onboard power supply system component if an actual request to the slave controller is present; putting the slave controller into a sleep mode and switching the master controller to an undertaking mode, in which the master controller responds to queries from the onboard power supply system component to the slave controller if no actual request to the slave controller is present, wherein in the sleep mode, after a particular period of time, the slave controller polling an input of the slave controller without wakeup capability to determine whether there is a request present; periodically repeating the polling, via the slave controller, whenever the particular period of time has elapsed for as long as the slave controller is in the sleep mode; switching the master controller to the sleep mode when there is no request present to the master controller and reducing a clock frequency of the master controller in the sleep mode in comparison with the transmission mode; and wherein at least one of the master controller or the slave controller at least to some extent accepts tasks from a door controller.