Lockup clutch control system
US4478322A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1981 |
| Grant date | Oct 23, 1984 |
| Priority date | — |
| Expiry date | Apr 24, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/143
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electronic control system for a lockup clutch includes a control system for receiving a vehicle speed signal and, as a function of adjustable engagement and release threshold signals, controlling a solenoid valve to engage and release a lockup clutch. The point of lockup is set by a potentiometer to represent a first vehicle speed, and the point of release is set by a variable resistor at a second speed, lower than the first. The variable resistor is switched into the circuit only after the first threshold level is passed and the clutch is locked up. A signal from the brake pedal overrides the threshold established in the control system to provide clutch disengagement as soon as the brake pedal is depressed. Various circuit components protect the control system from inadvertent damage by the driver and/or vehicle maintenance personnel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.