Method for controlling a drivetrain of a vehicle, with a drive motor and a gearbox

US8165766B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Norbert Muller · Tamm, DE
• Franz Schuler · Kreßbronn, DE
• Clemens Kuhn · Eriskirch, DE

Key dates

• Filing date: Jun 27, 2006
• Grant date: Apr 24, 2012
• Expiry date: Aug 15, 2029

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60W2710/105
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method for controlling a vehicles drivetrain including an engine and automatic transmission, such that transmission ratios are shifted within a range of transmission ratios in a continuous and/or stepped manner as function of preset target speeds that are adjustable via a vehicle speed control and actual vehicle inclinations in relation to the vehicles longitudinal axis. When the actual speed of the vehicle differs from a preset threshold speed, a request to change an actual ratio of the transmission is generated, if it has been determined that the output torque is smaller than a threshold value or an output torque required to adjust the preset threshold speed of the vehicle. The ratio of the transmission is shifted so the torque applied to the output is modified toward the output torque required to adjust the threshold speed.