Speed ratio controller and control method of toroidal continuous

Details Speed ratio controller and control method of toroidal continuous Speed ratio controller and control method of toroidal continuous

1999-08-10

2000-06-13

Cuchlinski, Jr., Willaim A.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

701 54, 701 68, 477 37, 477107, 477 11, 475254, 475269, 475186, 180170, 476 10, G06F 700, F16H 1548, F16H 6130, B60K 4112

Patent

active

060760311

ABSTRACT:
A speed ratio of a toroidal continuously variable transmission is varied by a step motor (4). The step motor (4) is responsive to a command signal Astep which a controller (61) outputs corresponding to a target speed ratio. The controller (61) is programmed to initialize the command signal Astep when it is activated while the vehicle is running (S152) such that the command signal coincides with an actual operation position of the step motor (4). The controller (61) is further programmed to limit the command signal, after performing this initialization, within a first limiting range which is narrower than a second limiting range corresponding to a physical operation limit of the step motor (4) (S168, S170). By applying such a limitation to the command signal, the command signal is prevented from exceeding the operation limit of the step motor (4) even when a torque shift error is introduced into the command signal by the initialization while the vehicle is running.

REFERENCES:
patent: 4107776 (1978-08-01), Beale
patent: 4361060 (1982-11-01), Smyth
patent: 5807206 (1998-09-01), Okazaki

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