System for controlling transmission ratio of transmission for automotive vehicles
US4466312A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 1981 |
| Grant date | Aug 21, 1984 |
| Priority date | — |
| Expiry date | May 27, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2015/383
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A system for controlling the transmission ratio of an infinitely variable transmission in the present invention which includes PA1 an infinitely variable control of the transmission ratio e within a range between L and H positions which is accomplished by follow-up-wisely actuating a spring-backed spool in an actuator of transmission ratio control servo RCS against the spring force in accordance with the signal pressure established by the compensation valve through the equilibrium between pressures responsive to the vehicle speed and throttle opening; PA1 a transmission characteristic diagram having a low ratio (L) fixed area, infinitely variable ratio area and high ratio (H) fixed area due to cooperation of the modulator valve 190 and kickdown valve 140; which system is capable of properly responding to gradual or sudden changes in throttle opening and vehicle speed; and PA1 expanding the low ratio (L) fixed area and infinitely variable area towards a higher speed area due to the regulating control to the vehicle speed responsive pressure by the hold valve operated by manual lock-up shifting in the manual select valve, which ratio area expanding allows for an effective shift down …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.