Method and control unit for operating a hybrid vehicle

US12179740B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Johannes Kemler · Ravensburg, DE
• Frank Deprez · Freising, DE

Key dates

• Filing date: Nov 16, 2021
• Grant date: Dec 31, 2024
• Expiry date: Nov 10, 2042

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/62
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method for operating a hybrid vehicle includes, depending on a presence of a control-side demand to engage a separating clutch (4), implementing an engagement process of the separating clutch (4) during driving under purely electric motor power and, depending on the presence of a control-side demand to implement an upshift in a transmission (5), implementing a gear ratio change from a current gear of the upshift into a target gear of the upshift. In response to the control-side demand to engage the separating clutch (4) and the control-side demand to implement the upshift, the method includes checking whether the upshift is necessary in order to prevent a vehicle-side rotational speed from reaching or exceeding a rotational speed limit value. When the upshift is necessary in order to prevent the vehicle-side rotational speed from reaching or exceeding the rotational speed limit value, the implementation of the upshift in the transmission is prioritized over the implementation of the engagement process of the separating clutch.