Automotive torque converter slip estimation
US6052640A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1997 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Nov 14, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60W30/1819
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Slip across a torque converter of an automotive powertrain is estimated using powertrain operating parameters throughout a powertrain operating cycle for use in powertrain control and diagnostic operations. Slip across the torque converter is estimated and is periodically updated in accordance with an adaptive control procedure to maintain model accuracy over time. The slip is estimated for both torque converter coupling and torque multiplication scenarios, with the greater of the estimates identified as indicating current slip. Current slip is applied to generate actual transmission gear ratio which is compared to commanded gear ratio when a transmission shift maneuver is not in process to identify transmission solenoid fault conditions, and which is applied for precise transmission shift enhancement control during a transmission shift maneuver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.