Control arrangement for an automatic change-speed transmission series-connected with output of driving engine
US4464955A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1980 |
| Grant date | Aug 14, 1984 |
| Priority date | — |
| Expiry date | Aug 1, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/029
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control arrangement for an automatic change-speed transmission which is series-connected with an output of a driving engine. A gearshift control slide valve, a manually operable range selection control slide valve, and a gear-holding control slide valve operating in dependence upon a modulating control pressure related to the torque of the driving engine are connected in such a manner that the gearshift control slide valve is held in a position for a higher gear if the driving engine is in an idling position and the range selection control slide valve is in a position for a forward gear range. A downshift control member, operable by a control linkage of a power control of the driving engine affects the modulating pressure to be made effective at the gear-holding control slide valve in such a manner that, upon operating the control linkage from an idling position, the gear-holding control slide valve and gearshift control slide valve are brought into their positions for the lowest gear. A pressure regulating valve adjusts a vacuum pressure effective on a modulating pressure control slide valve in dependence upon positions of the control linkage, and the downshift control member af…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.