Method for controlling the output torque of an automatic transmission
US5603672A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2306/52
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The invention relates to a method and an apparatus for controlling the output torque (M.sub.ab) of an automatic transmission 10 during the course of a gear-shifting operation in an engine-operated vehicle. The transmission 10 has at least two gears (11, 12) which can be engaged alternatively by means of clutches (16, 17). The clutches (16, 17) and the torque (M.sub.m) of the vehicle engine 14 are controlled according to at least two control sequences (SH1 to SH3, SR1 to SR3 or ZH, ZR) which can be selected as a function of instantaneously present gear-shifting conditions. According to the invention, in order to select the control sequences (SH1 to SH3, SR1 to SR3 or ZH, ZR) it is determined, as a gear-shifting condition, whether the vehicle is in an operating state with a positive clutch torque (engine traction operation) or in an operating state with a negative clutch torque (engine overrun operation).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.