Digital electronic controller for power transmission
US4015488A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1975 |
| Grant date | Apr 5, 1977 |
| Priority date | — |
| Expiry date | Sep 29, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/16
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A power transmission system includes an engine-driven lockup type torque converter for driving a gear shift mechanism shiftable to different speed ranges by solenoid operated clutch valves. A digital electronic controller provides output signals to operate the solenoids of the clutch valves. The controller receives input signals from a manually operable multiposition electric shift range selector switch; from an output speed sensor on the gear shift mechanism; and from an engine throttle position (on-off) switch. The controller comprises a counter circuit regulated by a system clock, for receiving amplified and shaped pulses from the speed sensor and for providing a counter signal related to gear shift mechanism output speed. The counter signals from the counter are presented to a speed matrix and signal pattern recognition circuits connected to the matrix ascertain whether certain speeds are reached. A shift logic circuit receives signals from the recognition circuits, from the range selector switch and from the throttle position switch and provides appropriate output signals to an up/down counter which in turn operates a decoder to provide control signals for operating solenoid d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.