Prediction of a voltage dip in a motor vehicle

US10670640B2 · kind B2 · utility

Assignee

• AUDI AG · DE

Inventors

• Daniel Renner · Wurmannsquick, DE
• Thomas Hackner · Greding, DE

Key dates

• Filing date: Jul 15, 2016
• Grant date: Jun 2, 2020
• Expiry date: Oct 1, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/92
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An embodiment relates to a method for predicting a voltage dip in a vehicle electrical system before a planned start of a load in a motor vehicle. The embodiment operates to ascertain a value of supply current expected to be required after the start of the load. An electrical voltage source and an energy store connected in parallel to a voltage source via the vehicle electrical system provide the supply current for operating the load. The energy store blocks a charge current into the energy store or blocks a discharge current out of the energy store based on a vehicle electrical system voltage of the vehicle electrical system being greater than a maximum value. Based on an instantaneous value of the vehicle electrical system voltage, the embodiment further ascertains a proportion of the supply current that the voltage source generates as a source current without the energy store until the vehicle electrical system voltage has fallen to the maximum value.