Electronic controller for automatic transmissions
US4892014A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1988 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | Feb 1, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2059/746
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A microprocessor controlled automatic transmission range shift selector positions the range shift valve in accordance with a shift request by an electric motor. A feedback transducer provides valve position information for motor control purposes. Vehicle conditions transducers including a door switch, a seat switch, vehicle speed and RPM sensors, ignition circuit status and key presence detectors, a parking brake sensor and a foot brake switch provide inputs to the microprocessor which is programmed to determine appropriate shifts to prevent requested range shifts in some cases and automatically initiating shifts into park in other cases. An automatic parking brake actuator and door lock actuators are also controlled by the microprocessor system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.