Patent · US Expired

Process for determining the shifting time for a transmission ratio change in an infinitely variable transmission

US5624348A · kind A · utility

7Cited by

7References

6Claims

0Family size

Assignee

Dr. Ing. h.c. F. Porsche AG · DE

Inventors

Patric Lardy · Weil der Stadt, DE
Joseph Petersmann · Wimsheim, DE

Key dates

Filing date	Nov 21, 1995
Grant date	Apr 29, 1997
Priority date	—
Expiry date	Nov 21, 2015

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2061/6616
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

The invention relates to a process for controlling a change of the transmission ratio (ue) in an infinitely variable transmission, which simulates a stepped transmission. A basic shifting time is determined separately for each shifting position and direction. In addition, a rotational speed factor, is used to take into account the change of the rotational input speed of the transmission caused by the change of the transmission ratio, and a lead factor reflects the lead existing at the transmission input. Shifting of the infinitely variable transmission is then performed as a function of the basic shifting time, the rotational speed factor and the lead factor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.