The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 2001
Filed:
Oct. 28, 1998
Zf Friedrichshafen AG, Friedrichshafen, DE;
Abstract
The invention relates to a process to evaluate start-up for an automatic vehicle gearbox, said process having the following steps: 1) a signal associated with an engine torque (M_M) or an engine speed (n_M) is emitted from an engine control device (,), and a signal associated with a torque (M_T) or a speed (n_T) of the turbine shaft (,) is emitted at the electronic gear control unit (,) by a measuring device (,) on a turbine shaft (,) of a converter (,) of the automatic gearbox (,); 2) the electronic gearbox control unit (,) determines a maximum value (Max) from time-related differences (DIFF(t)) between the engine torque (M_M) and the torque (M_T) of the turbine shaft (,) or the difference (DIFF(t)) between the engine speed (n_M) and the speed (n_T) of the turbine shaft (,); 3) a gear-change characteristic (SL) characterising a particular start-up style by comparing a theoretical driver-type value (FT_Soll_n) associated with the maximum (Max) with an actual driver-type value (FT_Ist) and the setting of a counter (,) is determined on the basis of the maximum value (Max) of the differences (DIFF(t)), said gear-change characteristic being meant to emit control signals to the hydraulic gearbox control unit (,).