Diagnostic apparatus for continuously variable transmission
US4698764A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1985 |
| Grant date | Oct 6, 1987 |
| Priority date | — |
| Expiry date | Jan 24, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/12
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A diagnostic apparatus for a continuously variable transmission the speed ratio and/or the rate of variation in the speed ratio of which are controlled by a shift-regulating device controlled by command signals from a control system. The diagnostic apparatus, which checks if the speed ratio is normally controlled, comprises: a detecting device for detecting an actual speed ratio and/or an actual rate of variation in the speed ratio; a memory storing data for determining normal ranges of the speed ratio and/or normal ranges of the rate of variation in the speed ratio, the normal ranges corresponding to shifting conditions of the transmission which are established by the shift-regulating device according to the command signals; and a judging device for selecting one of the normal ranges of the speed ratio, and/or one of the normal ranges of the rate of variation in the speed ratio, based on the command signals, the judging device checking whether the detected actual speed ratio and/or the detected actual rate of variation in the speed ratio fall within the selected normal ranges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.