Control system of vehicle driving system
US5944630A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1998 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Feb 26, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1926
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a vehicle driving unit employing a driving source formed by combining an engine with a motor generator, a control system prevents a sharp decline of an output torque of a transmission at the end of a shift operation without extending a time period required for the shift operation. The shift shock resulting from the sharp decline of the output torque can be eliminated. The vehicle driving unit is provided with an engine, a motor generator and a multi-stage automatic transmission for accomplishing a predetermined speed by engagement of friction engagement elements. The control system includes a shift operation termination determination step for determining the length of time remaining until the termination of a shift operation being performed by engagement of the friction engagement elements and a torque output command step for generating a torque assistance command to the motor generator based on the determination made during the shift operation termination determination step such that the transmission output torque decreases gently from a predetermined torque value. An assistance torque is outputted to prevent the sharp decline of the transmission output torque at the end of the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.