Patent · US Expired

Method and system for limiting the jolt during gear shifts in a motor vehicle

US4262557A · kind A · utility

7Cited by

4References

5Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Ferdinand Grob · Besigheim, DE
Friedrich Rabus · Schwieberdingen, DE

Key dates

Filing date	Dec 4, 1978
Grant date	Apr 21, 1981
Priority date	—
Expiry date	Dec 4, 1998

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2061/0078
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

Since the maximum jolt amplitude during gear shifts in an automatic transmission occurs when a frictional clutch band is first holding fully and since a mathematical relationship can be established between this maximum amplitude and the amplitude of the jolt while the band is slipping, the maximum permissible jolt amplitude during slippage (R.sub.O) is calculated as a function of the input and output speed of the transmission at the start of the gear shift and the predetermined maximum permissible over-all jolt amplitude (R.sub.max). The actual jolt amplitude is determined continuously, compared to R.sub.O, and the friction band is activated to maintain the actual jolt equal to R.sub.O, while the band is slipping.

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