Power train control system

US6285939A · kind A · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Uwe Heitz · Markdorf, DE
• Siegfried Dobler · Tettnang, DE
• Arun K. Chatterjee · Redmond, US

Key dates

• Filing date: Mar 22, 2000
• Grant date: Sep 4, 2001
• Expiry date: Mar 22, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19167
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A power train control (1) for a vehicle (8) or an automotive machine with a prime mover (5) with a governor (2) and a continuously variable transmission (7) with a ratio control (3). The power train control (1) coordinates the ratio control and the governor issuing a theoretical speed n_mot_nom to the governor (2) for the prime mover (5) and a nominal transmission ratio i_nom to the ratio control (3). The power train control (1) is designed as a combination of two governors, the transmission output speed governor (9) and the governor (10) for relief of the prime mover (5). The transmission output speed governor (9) receives the transmission output speed n_out as a control variable and generates the nominal speed n_mot_nom for the prime mover (5) as a manipulated value, and the governor (10) for relief of the prime mover (5) by the speed n_mot of the prime mover (5) as a control value and a transmission ratio correction value .DELTA.i as a manipulated value. The nominal transmission ratio i_nom is specified by addition of this correction value .DELTA.i to a coarse transmission nominal ratio i_0_nom, with the latter being specified as function of the nominal speed n_mot_nom of the pr…