Infinitely variable transmission

Details Infinitely variable transmission Infinitely variable transmission

1997-10-09

1999-10-26

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 48, F16H 3702, F16H 900

Patent

active

059718870

ABSTRACT:
A continuously variable transmission (CVT) has an increased speed of convergence on a neutral point by combining the rotation from the CVT and a constant velocity mechanism. At the neutral point the output member has zero rotation due to torque circulation. When a neutral state is determined to be needed based on the signals indicating the pulley ratio is within a predetermined range, with the throttle pedal being off or not depressed, and the brake pedal being on, the neutral control starts an operation to control the shaft force of both the primary and the secondary pulleys for the CVT. At the same time, the engine output is controlled by controlling the throttle opening degree and a predetermined torque is transmitted to the input shaft. As a result, the CVT converges on the gear neutral point (GN) at high speed due to an increase in the input torque of the CVT based on an increase in engine torque.

REFERENCES:
patent: 5662547 (1997-09-01), Moroto et al.
patent: 5669846 (1997-09-01), Moroto et al.

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