Electrical control for power shift transmission
US4425620A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1981 |
| Grant date | Jan 10, 1984 |
| Priority date | — |
| Expiry date | Jan 28, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2059/088
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electrical control provides output signals to a group of solenoid valves which control the gear ratio selected by a transmission. The electrical control receives input signals from a mode select lever, an upshift/downshift pulser lever, an engine RPM sensor, a ground speed sensor, a clutch position sensor switch, and a throttle control lever. The mode select lever has a neutral (N) position, a reverse (R) position, a forward manual (FM) position, and a forward automatic (FA) position. Movement of the mode select lever from N to FM causes the electronic control to actuate solenoid valves which select a first forward gear. Similarly, movement of the lever from N to R causes the control to actuate solenoid valves which provide a first reverse gear. Higher/lower gears are obtained by moving the upshift/downshift pulser lever from its normal position to either an upshift position or a downshift position. One upshift pulse causes the electronic control to actuate solenoid valves resulting in one gear shift upward. Holding the pulser lever forward in the upshift position gives sequential upshifts at predetermined time intervals. Pulsing or holding the pulser lever rearward in the downs…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.