Electrical machine control method and apparatus

US9616768B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Alexander Scheidle · Karlsruhe, DE
• Martin Wirth · Hitzendorf, AT

Key dates

• Filing date: Oct 5, 2012
• Grant date: Apr 11, 2017
• Expiry date: Feb 1, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S903/903
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

Method for controlling an electrical machine (14), in particular for an electric or hybrid drive train (12) of a motor vehicle (10), wherein the electrical machine (14) can provide a torque (T) both at positive and at negative speeds (n), having the steps of:—using a characteristic curve (M; G) to check whether a torque desired value (72; 74) can or may be provided by the electrical machine (14), wherein the characteristic curve (M; G) represents a limit torque with respect to the speed (n) and has a first section (A1; A4) for positive speeds and a second section (A2; A3) for negative speeds. In this case, the first section (A1; A4) and the second section (A2; A3) are arranged in the same quadrant (I; IV) of the characteristic curve (70).