Transmission system solenoid controlled actuator fault detection system and method
US5272441A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1991 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Mar 14, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/1268
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Open-circuit and closed-circuit faults in a solenoid controlled actuator are detected using shunt resistors (R1, R4) across the solenoid (1), a transistor switch (4), and a voltage monitor (7) and/or (14) across one or both of these which can detect a faulty open-circuit solenoid that is not energized, or a faulty closed-circuit solenoid that is energized. According to the present invention, before each change in actuator position, the solenoids are all caused to assume an opposite energization condition for a period of time insufficient to move the actuator, but enough to check the voltage monitor responses. In this way, both open and closed circuit faults are detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.