Torque converter slip control device
US4957194A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1988 |
| Grant date | Sep 18, 1990 |
| Priority date | — |
| Expiry date | Sep 8, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/145
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A torque converter slip control device used in an automatic transmission of an internal combustion engine of a vehicle has a torque converter to transfer engine torque to an input shaft of the automatic transmission. A feed-forward slip control subroutine controls a hydraulic circuit in a feed-forward control to vary the coupling efficiency of a lockup clutch to cause the torque converter to allow slippage at a rate suitable for cancelling a fluctuation of engine torque when the internal combustion engine is at rotational speeds higher than a preselected rotational speed higher than a predetermined fuel injection recovery speed at which an injection of fuel by a fuel system is recovered during the detection of the deceleration state of the vehicle by a deceleration senser. A feed-back slip control subroutine controls the hydraulic circuit in feed-back control to vary the coupling efficiency of the lockup clutch to make a difference of rotational speed between input and output shafts of the torque converter suitable for cancelling a fluctuation of engine torque when the internal combustion engine is at rotational speeds lower than the preselected rotational speed during the detectio…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.