Diagnostic apparatus for continuously variable transmission

Details Diagnostic apparatus for continuously variable transmission Diagnostic apparatus for continuously variable transmission

1985-01-24

1987-10-06

Lall, Parshotam S.

Boots, shoes, and leggings

74866, B60K 4100

Patent

active

046987649

ABSTRACT:
A diagnostic apparatus for a continuously variable transmission the speed ratio and/or the rate of variation in the speed ratio of which are controlled by a shift-regulating device controlled by command signals from a control system. The diagnostic apparatus, which checks if the speed ratio is normally controlled, comprises: a detecting device for detecting an actual speed ratio and/or an actual rate of variation in the speed ratio; a memory storing data for determining normal ranges of the speed ratio and/or normal ranges of the rate of variation in the speed ratio, the normal ranges corresponding to shifting conditions of the transmission which are established by the shift-regulating device according to the command signals; and a judging device for selecting one of the normal ranges of the speed ratio, and/or one of the normal ranges of the rate of variation in the speed ratio, based on the command signals, the judging device checking whether the detected actual speed ratio and/or the detected actual rate of variation in the speed ratio fall within the selected normal ranges.

REFERENCES:
patent: 4079638 (1978-03-01), Sibeud
patent: 4373619 (1983-02-01), Schritt et al.
patent: 4387608 (1983-06-01), Mohl et al.
patent: 4495457 (1985-01-01), Stahl
patent: 4543077 (1985-09-01), Yamamuro et al.

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