Control system for continuously variable transmission

Endless belt power transmission systems or components – Pulley with belt-receiving groove formed by drive faces on... – Load responsive

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474 28, 474 70, F16H 6106, F16H 6118

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053341023

ABSTRACT:
A control system for a belt-type continuously variable transmission of a motor vehicle, having a primary and a secondary control valve for varying the transmission ratio. The primary control valve receives an electric signal from a control unit to vary a primary hydraulic pressure. The primary control valve produces a primary pressure which causes the transmission to take an intermediate transmission ratio when the electric signal is not transmitted due to a failure such as breakage of a cable. Thus, dangerous situations of the vehicle are prevented, and the vehicle can reliably start in a relatively low speed range of the transmission.

REFERENCES:
patent: 4547178 (1985-10-01), Hayakawa et al.
patent: 4589071 (1986-05-01), Yamamuro et al.
patent: 4782934 (1988-11-01), Takano et al.
Search Report of British Patent Office dated Dec. 16, 1992.

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