Method and device for adapting a voltage limit in an onboard electrical system

• US 9,764,700 B2
• Filed: 12/19/2012
• Issued: 09/19/2017
• Est. Priority Date: 12/19/2011
• Status: Active Grant

• Current Assignee: Seg Automotive Germany GMBH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schmidt, Matthias
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): YESHAW, ESAYAS G
• Application Number:
  US14/367,049
• Publication Number:
  US 20140368031A1
• Time in Patent Office: 1,735 Days
• Field of Search: 307 101
• CPC Class Codes: B60L 15/2045 for optimising the use of energy
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 50/60 using power supplied by batteries in combination with fuel cells B60L50/75
• CPC Class Codes: B60L 7/10 Dynamic electric regenerative braking B60L7/22 takes precedence
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: H02J 7/1446 in response to parameters of a vehicle
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

A method is described for controlling a voltage limit for a maximally permissible operating voltage in an on-board electrical system of a vehicle, including the step of adapting the voltage limit in dependence on vehicle data, wherein an actual voltage is ascertained and the actual voltage is short-circuited or limited if the actual voltage exceeds the voltage limit. Also described is a device for controlling a voltage limit for a maximally permissible operating voltage in an on-board electrical system of a vehicle, having an adaptation device for adapting the voltage limit in dependence on vehicle data.

Claims

1. A method for controlling a voltage limit for a maximally permissible operating voltage in an on-board electrical system of a vehicle, comprising:

regulating an actual voltage of the on-board electrical system to a desired voltage, wherein the desired voltage is less than the maximally permissible operating voltage;

one of limiting and short-circuiting the actual voltage if the actual voltage exceeds the maximally permissible operating voltage in the on-board electrical system; and

adapting the voltage limit in dependence on vehicle data by one of raising and lowering the voltage limit, wherein the voltage limit is adapted temporarily from a first value that is above a voltage of a battery of the on-board electrical system to a second value that is above the first value.

2. The method as recited in claim 1, wherein the vehicle data indicate a speed of the vehicle and the voltage limit is adapted in dependence on the speed.

3. The method as recited in claim 2, wherein the voltage limit is raised if a predefined speed of the vehicle is exceeded.

4. The method as recited in claim 3, wherein the voltage limit below the predefined speed is set to a predefined value.

5. The method as recited in claim 4, wherein the predefined value is below 60 V.

6. The method as recited in claim 1, wherein a voltage value that indicates a load dump in the on-board electrical system is set in dependence on the voltage limit produced by the adapting.

7. The method as recited in claim 6, wherein the voltage value that indicates the load dump in the on-board electrical system is in each case above the voltage limit produced by the adapting by a predefined amount.

8. The method as recited in claim 1, wherein the vehicle data are data that indicate an actuation of a brake pedal, and the voltage limit is adapted in dependence on the actuation of the brake pedal.

9. The method as recited in claim 8, wherein the voltage limit is raised upon actuation of the brake pedal, and the raised voltage limit is lowered after a predefined period of time after a release of the brake pedal.

10. The method as recited in claim 1, wherein the vehicle data indicate an acceleration of the vehicle, and the voltage limit is adapted in dependence on the acceleration.

11. The method as recited in claim 1, wherein:

when the vehicle data indicates an unlocking of an engine hood, the voltage limit is lowered, and

when the vehicle data indicates a locking of the engine hood, the voltage limit is raised.

12. A device for controlling a voltage limit for a maximally permissible operating voltage in an on-board electrical system of a vehicle, comprising:

an arrangement for regulating an actual voltage of the on-board electrical system to a desired voltage, wherein the desired voltage is less than the maximally permissible operating voltage;

an arrangement for one of limiting and short-circuiting the actual voltage if the actual voltage exceeds the maximally permissible operating voltage in the on-board electrical system; and

an arrangement for adapting the voltage limit in dependence on vehicle data by one of raising and lowering the voltage limit, wherein the voltage limit is adapted temporarily from a first value that is above a voltage of a battery of the on-board electrical system to a second value that is above the first value.

13. The device as recited in claim 12, wherein:

when the vehicle data indicates an unlocking of an engine hood, the voltage limit is lowered, and

when the vehicle data indicates a locking of the engine hood, the voltage limit is raised.