Shift control apparatus for continuously variable transmission and shift control method therefor
US6691012B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2003 |
| Grant date | Feb 10, 2004 |
| Priority date | — |
| Expiry date | Feb 19, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0015
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A shift control apparatus for a continuously variable transmission has a target primary pressure setting unit provided a target primary pressure according to a speed ratio deviation between an actual speed ratio and a target speed ratio; a shift control valve for regulating flow rate of hydraulic oil supplied to the primary cylinder by changing an opening area of the shift control valve according to current supplied to an electromagnetic coil; a primary pressure detecting unit; and a control unit for controlling the speed ratio by correcting a basic current set to be based upon the target primary pressure and supplied to the electromagnetic coil by feeding back the primary pressure detected by the primary pressure detecting unit, so as to have an excellent shift feeling, being able to decrease a fuel consumption by reducing the load of a pump and by quickly shifting to an optimum speed ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.