Control system for an electromagnetic clutch for automobiles
US4515257A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1982 |
| Grant date | May 7, 1985 |
| Priority date | — |
| Expiry date | Nov 26, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2500/7109
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A control system for a belt-drive continuously variable transmission. The transmission is connected to a crankshaft of an engine through an electromagnetic powder clutch. The control system has a vacuum switch which is closed by rapid release of an accelerator pedal for producing engine braking effect, a gate circuit including a NOR gate, and an astable multivibrator. The NOR gate is opened for a short time decided by a time constant circuit, and the multivibrator supplies pulses through the NOR gate to a switching transistor provided in a circuit of the electromagnetic clutch for periodically opening the transistor during the opening of the NOR gate. Thus, the electromagnetic clutch is intermittently engaged for providing partial engagement of the clutch for the short time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.