Ratio control technique for continuously variable transmission

Details Ratio control technique for continuously variable transmission Ratio control technique for continuously variable transmission

1987-03-13

1989-03-07

Lall, Parshotam S.

Boots, shoes, and leggings

74866, 74867, F16H 1106, F16H 5556

Patent

active

048112259

ABSTRACT:
A ratio control system for use in a continuously variable transmission is disclosed in conjunction with an improved technique for operation thereof. Individual gain schedules provide proportional gain in response to a selected one of a number of modes dependent upon clutch input speed, transmission belt ratio, or engine set point. Engine speed set point is determined as a function of a set point schedule in conjunction with a limiter and a filter to provide a gradual response to rapid changes in a throttle input or driver demand signal and vehicle speed. The error signal generated as an output of any of the proportional gain loops is integrated and combined with a null signal to provide a signal to generate a duty cycle for a pulse width modulation controlled electrohydraulic control valve to control the pressure to the primary sheave in a continuously variable transmission system for modifying the belt ratio. An integration function may be used or bypassed at appropriate times to account for physical limitations in the possible range for the belt ratio. Full low and full overdrive conditions are provided through an open loop gain corresponding to maximum and minimum duty cycle signals.

REFERENCES:
patent: 4231092 (1980-10-01), Grob et al.
patent: 4458318 (1984-07-01), Snut et al.
patent: 4522086 (1985-06-01), Haley
patent: 4539866 (1985-09-01), Koivunen
patent: 4689745 (1987-08-01), Itoh et al.
patent: 4706789 (1987-11-01), McColl et al.
patent: 4724724 (1988-02-01), Tezuka

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