Speed ratio controller and control method of continuously transmisson
US6292730A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1999 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Jun 23, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/18
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a vehicle continuously variable transmission, an engine rotation speed, input rotation speed of the transmission and an output rotation speed of the transmission are respectively detected by sensors (64, 65, 68). Based on the output signals from these rotation speed sensors (64, 65, 68), a controller (61) controls a speed ratio of the transmission within a predetermined speed ratio range. The controller (61) also determines if any of the rotation speed sensors (64, 65, 68) has an abnormality based on the output signals from these sensors (64, 65, 68) and narrows the predetermined speed ratio range (S234) when any of the sensors has been determined to have an abnormality, so as to prevent an extraordinary speed ratio control from being performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.