System for controlling transmission ratio of transmission for automotive vehicles
US4480504A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1981 |
| Grant date | Nov 6, 1984 |
| Priority date | — |
| Expiry date | May 12, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2015/383
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The transmission ratio of an infinitely variable transmission for automotive vehicles is controlled by a system including a hydraulic servo. The servo mechanism including an actuator which is driven by a line pressure to actuate the transmission and a spool having one end to which a signal pressure responsive to both throttle opening responsive pressure and vehicle speed responsive pressure is applied counteractingly against a spring. The spool provides a control valve function for the driving fluid pressure to the actuator. In response to signal pressure change to the spool the actuator is actuated in such direction that the transmission ratio is decreased or increased. The signal pressure is produced by a compensation valve due to a throttle opening responsive pressure and vehicle speed responsive pressure, e.g. governor pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.