METHOD FOR OPERATING AN ELECTRICAL SYSTEM OF A MOTOR VEHICLE AND BUS SYSTEM OPERATING IN ACCORDANCE WITH THE METHOD

• US 20130274897A1
• Filed: 06/10/2013
• Published: 10/17/2013
• Est. Priority Date: 12/08/2010
• Status: Active Grant

• Current Assignee: Brose Fahrzeugteile GmbH & Company KG Hallstadt (Brose)
• Original Assignee: Brose Fahrzeugteile GmbH & Co. KG
• Inventors: HERTHAN, BERND, WAGNER, BURKHARD, FEUSTEL, ARMIN, SCHIEGEL, STEFAN, BUEHLER, MATTHIAS
• Granted Patent: US 9,599,971 B2
• Time in Patent Office: Days
• US Class Current: 700/3
• CPC Class Codes: G05B 11/01 electric
• CPC Class Codes: H04L 12/40039 Details regarding the setting of the power status of a node according to activity on the bus
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling
• CPC Class Codes: H04L 12/4625 Single bridge functionality, e.g. connection of two networks over a single bridge
• CPC Class Codes: H04L 2012/40215 Controller Area Network CAN
• CPC Class Codes: H04L 2012/40234 Local Interconnect Network LIN
• CPC Class Codes: H04L 2012/40241 Flexray
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A method operates an onboard power supply system in a motor vehicle. The onboard power supply system has a master controller and a slave controller, in which the master controller communicates with the slave controller via a subsidiary bus system and a further onboard power supply system component via a main bus system. Present requests are received in the slave controller and in response to the present requests, performing one 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; or 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.

Claims

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:

receiving present requests in the slave controller and in response to the present requests, performing one 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;

or

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.

2. The method according to claim 1, wherein in the undertaking mode, during communication with the onboard power supply system component, the master controller simulates the slave controller being in the operating mode.

3. The method according to claim 1, wherein in the sleep mode, after a particular period of time, the slave controller polls an input without wakeup capability to determine whether there is a present request.

4. The method according to claim 3, wherein the slave controller periodically repeats polling whenever the particular period of time has elapsed for as long as the slave controller is in the sleep mode.

5. The method according to claim 1, which further comprises switching the master controller to the sleep mode when there is no present request to the master controller.

6. The method according to claim 5, which further comprises reducing a clock frequency of the master controller in the sleep mode in comparison with the transmission mode.

7. The method according to claim 1, wherein at least one of the master controller or the slave controller at least to some extent accepts tasks from a door controller.

8. A bus system in an onboard power supply system in a motor vehicle, the bus system comprising:

a main bus;

a subsidiary bus system;

a master controller connected to said main bus and said subsidiary bus system;

at least one slave controller connected to said subsidiary bus system, if said slave controller receives a present request, either;

said slave controller is put into an operating mode and said master controller switches to a transmission mode, in which said master controller coordinates communication between said slave controller and an onboard power supply system component;

or

said slave controller is put into a sleep mode and said master controller switches to an undertaking mode, in which said master controller responds to queries from the onboard power supply system component to said slave controller.

9. The bus system according to claim 8, wherein:

said main bus is selected from the group consisting of a controller area network (CAN) bus system and a Flexray bus system; and

said subsidiary bus system is a local interconnect network (LIN) bus system.