Control system for an infinitely variable transmission with an electromagnetic powder clutch
A system is described for controlling an infinitely variable transmission for a vehicle which comprises a driving pulley, a driven pulley and a belt engaged with both pulleys, the transmission ratio thereof being automatically varied by changing effective diameters of both pulleys with the belt. The system consists of: an electromagnetic clutch for coupling a crankshaft of an engine with an input shaft of the transmission; the electromagnetic clutch having a coil for engaging the clutch by current flowing through the coil partially and completely, respectively; first circuit means for producing an engine speed signal; second circuit means for producing a vehicle speed signal dependent on vehicle speed; arithmetic circuit means for controlling the clutch current flowing through the coil in dependency on the engine speed signal and the vehicle speed signal; the arithmetic circuit means is for cutting off the clutch current so as to disengage the clutch at a low vehicle speed when the engine speed has decreased to a predetermined value which is slightly higher than an engine speed at which the engine stalls at the low vehicle speed.
- Assignee:
- Fuji Jukogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4605112
- OSTI ID:
- 5407555
- Resource Relation:
- Patent File Date: Filed date 04 Oct 1983
- Country of Publication:
- United States
- Language:
- English
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Control system for an infinitely variable transmission
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