Automatic control means for infinitely variable transmission

Details Automatic control means for infinitely variable transmission Automatic control means for infinitely variable transmission

1975-07-07

1977-05-17

Scott, Samuel

Machine element or mechanism

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

Preselected indexed position

74861, B60K 4116

Patent

active

040234428

ABSTRACT:
This invention describes a system of control for a power source-transmission-load system such as might be used on an off-the-road vehicle, for example. The power source is an internal combustion engine having a known optimum characteristic of desired manifold vacuum versus engine speed. The transmission is a hydrostatic or hydromechanical transmission having infinitely variable speed ratio and having a control means for varying said speed ratio.
The control system includes a transducer means for measuring engine speed and converting this quantity into an analog fluid pressure proportional to the speed. This analog fluid pressure proportional to speed is modified in a function generator to produce an analog fluid pressure which is proportional to the desired manifold vacuum as a function of engine speed. Means are provided for measuring the actual manifold vacuum and for comparing the actual manifold vacuum with the desired manifold vacuum on a continuous basis. This comparison produces an error signal which is amplified and used to control a hydraulic system to operate the control means in order to vary the transmission ratio of the hydrostatic or hydromechanical transmission to obtain a speed ratio such that will provide optimum engine conditions.

REFERENCES:
patent: 3121483 (1964-02-01), Lietz
patent: 3360069 (1967-12-01), Chana et al.
patent: 3738197 (1973-06-01), Brumm et al.
patent: 3741042 (1973-06-01), Ravenel
patent: 3855793 (1974-12-01), Pollman et al.
patent: 3927528 (1975-12-01), VAN DER Kolk et al.
patent: 3932991 (1976-01-01), Clerk

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