Transmission ratio control system for a continuously variable tr

Details Transmission ratio control system for a continuously variable tr Transmission ratio control system for a continuously variable tr

1988-11-18

1991-06-04

Diehl, Dwight G.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, B60K 4114

Patent

active

050203924

ABSTRACT:
A control system for a continuously variable transmission has a transmission ratio control valve having a spool for controlling oil supplied to a cylinder of a drive pulley to change the transmission ratio. The transmission ratio control valve has chamber at both ends of the spool. By controlling the flow rate of oil supplied to the chambers in accordance with a desired transmission ratio, the spool is shifted, so that the rate of change of the transmission ratio is controlled. The transmission ratio changing rate is corrected by the rate of change of the desired transmission ratio. Two coefficients representative of the degree of throttle opening and a physical condition such as viscosity are also generated to correct the transmission ratio changing rate.

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