Electronic control for a stepless vehicle transmission using a c

Details Electronic control for a stepless vehicle transmission using a c Electronic control for a stepless vehicle transmission using a c

1980-09-11

1984-07-31

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

3644241, 474 12, 474 18, B60K 4110, G06F 1550

Patent

active

044622759

ABSTRACT:
To control transmission ratio of a continuously variable transmission connected to a combustion engine (e.g., for optimal fuel efficiency of a powered vehicle), effective diameter of pulleys is controlled in response to an electrical signal. A control signal suitable for comparison with hydrostatic pressure values is produced by a computing device based on input signals representing load, speed, and other operating conditions and based further on stored data representing engine characteristics. A control signal is conveniently used to control hydrostatic pressure by means of electromagnetically operated valves. Especially when pulsed valves controlled by digital electric signals are used, a reservoir is used to establish a steady hydrostatic pressure. Such control device is readily adapted to different engines by replacement of stored characteristic data.

REFERENCES:
patent: 3115049 (1963-12-01), Moan
patent: 4091690 (1978-05-01), Miyao
patent: 4106367 (1978-08-01), Bouvet
patent: 4152947 (1979-05-01), van Deursen et al.
patent: 4241618 (1980-12-01), Smirl
patent: 4246807 (1981-01-01), Kofink
patent: 4261229 (1981-04-01), Mizuno et al.
patent: 4274520 (1981-06-01), Van der Hardt Aberson

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