Control system for a toroidal continuously variable transmission

Details Control system for a toroidal continuously variable transmission Control system for a toroidal continuously variable transmission

1999-03-09

2000-04-04

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

476 41, 476 42, B60K 4112, F16H 1310, F16H 1538

Patent

active

060454814

ABSTRACT:
A control system for a toroidal continuously variable transmission which can control the transmission ratio without installing a position detection device or an angle detection device on trunnions and secure a sufficient control response to prevent hunting of the transmission ratio. To realize this control system, an axial force calculation device M3 calculates the axial force 2Ft in the trunnion axis direction that the transmission ratio control actuators are required to generate, based on the transmission ratio i calculated by a transmission ratio calculation device M1 from the input disk revolution speed .omega..sub.1 and the output disk revolution speed .omega..sub.2, and on the input torque Ti or output torque To estimated by a torque estimation device M2. An axial force change calculation device M4 calculates the amount of change in the axial force .DELTA.Ft based on the deviation between the target transmission ratio ic and the transmission ratio i. A target axial force calculation device M5 adds the axial force 2Ft to the amount of change in the axial force .DELTA.Ft to calculate the target axial force Fc. An actuator drive device M6 drives the actuators according to the target axial force Fc to match the transmission ratio i to the target transmission ratio ic.

REFERENCES:
patent: 4481844 (1984-11-01), Ironside et al.
patent: 5042326 (1991-08-01), Hibi et al.
patent: 5538483 (1996-07-01), Kobayashi et al.
patent: 5885185 (1999-03-01), Kidokoro et al.
patent: 5935039 (1999-08-01), Sakai et al.

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