Shift control system, and control apparatus and method for belt-type continuously variable transmission
US7140991B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2003 |
| Grant date | Nov 28, 2006 |
| Priority date | — |
| Expiry date | Jun 20, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/6612
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A shift control system includes a belt-type continuously variable transmission (CVT) with primary and secondary pulleys, a shift actuator that regulates an oil pressure supplied to the primary or secondary pulley to vary an actual transmission ratio of the CVT, and a control unit that controls the shift actuator. The control unit sets a target transmission ratio in a first mode when a normal driving range is selected and in a second mode when an engine braking range is selected, drives the shift actuator to adjust the actual transmission ratio to the target transmission ratio, determines a delay time to delay the setting of the target transmission ratio in the second mode at the time of range switchover from the normal driving range to the engine braking range, and holds the target transmission ratio set in the first mode until the delay time has elapsed from the range switchover.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.